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BillyZ
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Before determining blood types are intractable as has been made out, I may request that the following link be gone through.
https://link.springer.com/article/10.10 ... 015-2019-5
Notwithstanding these cases, it has also been reported in media that treatments of the dreaded Rubella disease and transplants involving bone marrow and liver also may cause blood group jumping.
The idea of this response is not to impress upon some medical phenomena but to dispel the myth blood groping is eternal and everlasting.
But coming to grammar, how about this? Which one is correct?

Eve told Adam that apples were tempting
Eve told Adam that apples are tempting.
(to be sure, apples are always tempting)
Of course I know Brain will say why one should look at the larger picture in GMAT rather than to exceptions to general rule. I will mostly agree with that stand.
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I agree with Daag sir , this is not a good question. when a past event is explained every present tense is shifted to past irrespective of the nature of the statement.
Related explanation can be found in Manhattan SC book
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sequence of tenses is explaned in grammar books. we do have to review grammar but remember gmat test very basics grammar.

sequence rules dictates that if the main clause is in the past tense, normally the tenses in dependent clauses are in the past. this means the tenses in dependent clauses can be in different tenses depending on meaning/ logic

simple present is about the fact or condition which is correct and will be-is thought-correct indefinitely. so E fit the point.
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While the nurses frantically searched for his parents to collect his vital information, the injured boy calmly explained to the doctor that his blood type was O positive.

(A) the injured boy calmly explained to the doctor that his blood type was O positive

(B) the injured boy had calmly explained to the doctor that his blood type was O positive

(C) the boy was injured and explained that his blood type is O positive to the doctor

(D) the boy, who was injured, calmly explained to the doctor that his blood type was O positive

(E) the injured boy calmly explained to the doctor that his blood type is O positive

My take on E - It is the only answer choice that doesn't change the meaning. To say that the boy's blood type WAS O positive, means that it isn't O positive anymore.
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This problem is based on a misconception. When we're writing a sentence that takes place in the past, there is nothing wrong with using all past tense verbs, even if we are describing something that is still the case. For instance, I could say "When the guy next to me on the plane learned I was a Manhattan Prep instructor, he began a barrage of grammar questions that lasted the whole flight." The correctness of this sentence doesn't depend on whether I am a Manhattan Prep instructor now. It works on its own merits. Therefore, there is no valid reason to select E over A.
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Please let us know your thoughts on this question. Confusion is between choice A and E. Thanks...
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Dear Daag Sir and Other Experts, with regards, I am here new to chip you all, but being Engineer, I follow logics and practicality of things. I would like to say something. Everything is relative to each other and each rule of any language comes from uses and experience of native speakers. Here I would like to say that GMAT clearly writes that "Choose best option , that is properly conveying meaning of sentence."

Here is close fight in between option A and option E.

May be for a while a suppose option A is correct, but think for a second is sentence - "While the nurses frantically searched for his parents to collect his vital information, the injured boy calmly explained to the doctor that his blood type was O positive." is conveying proper logical meaning. Injured boy explained his blood group was O positive. That mean he is not sure right now what is his blood group. He want to check up??? --- It's irrelevant , how blood group can change ??? - Hence option A is not able to convey proper meaning.

Let's come to the option E - "While the nurses frantically searched for his parents to collect his vital information,the injured boy calmly explained to the doctor that his blood type is O positive ." Here meaning is logically correct. Boy is sure about his blood group. As per GMAT rule which option is proper conveying meaning that is correct.

Here Option E is best choice in all 5.

While the nurses frantically searched for his parents to collect his vital information, the injured boy calmly explained to the doctor that his blood type was O positive.

(A) the injured boy calmly explained to the doctor that his blood type was O positive

(B) the injured boy had calmly explained to the doctor that his blood type was O positive

(C) the boy was injured and explained that his blood type is O positive to the doctor

(D) the boy, who was injured, calmly explained to the doctor that his blood type was O positive

(E) the injured boy calmly explained to the doctor that his blood type is O positive
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Sarkar93 What I'm suggesting is that there is no valid answer. Whoever wrote it is assuming that we should make a distinction that does not in fact need to be made.

iamjaipandey The GMAT does indeed ask us for the best answer, but if you look at official questions, the four wrong answers are almost always clearly incorrect in some way. The same is often not true of third-party questions. That's why it's best to study from the real thing.
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