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Bunuel
A team of researchers at a university hospital has developed a chemical test that detects breast tumors in the early stages of development. In order to save lives, the researchers want to make the test a routine part of examinations at the hospital. However, a spokesperson for the hospital argued that because virtually all breast tumors are detectable by self-examination, the chemical test would have little impact on the breast cancer death rate.

Which of the following, if true, would most seriously weaken the hospital spokesperson’s argument?


A. Fatal breast tumors are often not revealed by self-examination until it is too late for effective treatment.

B. Breast tumors are usually discovered at an earlier stage of development than are lung tumors.

C. Mammograms are currently in wide use as a breast cancer test and cost much less than the chemical test.

D. Because men are not typically victims of breast cancer, the new test would benefit only half of the population.

E. Most women learn how to check for signs of breast cancer from magazines and not from doctors.





Official Explanation:



A

Step 1: Identify the Question Type

In addition to using the word “weaken” to signal the question type, this question stem points us to the “spokesperson’s argument.”

Step 2: Untangle the Stimulus

The spokesperson’s conclusion is a prediction that the chemical test will have little impact on the breast cancer death rate. The spokesperson’s evidence is that virtually all breast tumors are detectable by self-examination.

Step 3: Predict the Answer

The spokesperson assumes that the chemical test has no advantage over self-examination. Because this is a Weaken question, we need the answer choice that contradicts this assumption—so we’ll scan for a choice that cites an advantage of the chemical test.

Step 4: Evaluate the Choices

(A) suggests a possible advantage of the chemical test. The stimulus states that the chemical test “detects breast tumors in the early stages of development.” If it is true that self-examination reveals those same tumors too late for effective treatment, then the chemical test might in fact have an impact on the breast cancer death rate, and the conclusion is weakened. This is the correct answer. (B) is an irrelevant comparison between breast tumors and lung tumors. (C) introduces a different diagnostic tool, mammograms, which are outside the scope of the question of whether the chemical test would have any positive impact relative to self-examination. (D) is outside the scope. The fact that men typically do not contract breast cancer is irrelevant to the question of whether the chemical test would positively impact the breast cancer death rate. (E) is again outside the scope. Where women learn to do breast exams has no bearing on the assumption that the chemical test has no advantage over those exams. Choice (A) is the correct answer.
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