A new drug, taken twice daily for one month, is an effective treatment

A new drug, taken twice daily for one month, is an effective treatment for a certain disease. The drug now most commonly prescribed for the disease occasionally has serious side effects such as seizures; the new drug has side effects much more frequently, but the worst of them is mild nausea. Therefore, the new drug is clearly preferable as a treatment.

Which of the following, if true, most seriously weakens the argument?

A) It is possible that the drug now most commonly prescribed has side effects that have not yet been attributed to it.
B) People who experience nausea are prone to discontinue use of the new drug prematurely.
C) Other drugs for the disease have typically been prescribed only for patients allergic to the most commonly prescribed drug.
D) People who have received effective treatment for disease do not generally contract the disease again.
E) There is a nonprescription medication that when taken with the new drug prevents the onset of nausea.



Premise: New drug has freq. side effect but their intensity is less therefore new drug is preferable
Missing Link: Freq. of side effect(new drug) does not affect more than the side effect(old drug)

A) It is possible that the drug now most commonly prescribed has side effects that have not yet been attributed to it. - 180 option, it is rather strengthing the argument
B) People who experience nausea are prone to discontinue use of the new drug prematurely.- Bingo!if the sheer one time nausea can make the drug usage discontinued, then this drug can not be preferred for prescription
C) Other drugs for the disease have typically been prescribed only for patients allergic to the most commonly prescribed drug. - we are not at all bothered about other drugs, it is a leap of faith
D) People who have received effective treatment for disease do not generally contract the disease again. - what about the new patients? and even if they do not contract it again then on what grounds we can negate the effectiveness of new drug
E) There is a nonprescription medication that when taken with the new drug prevents the onset of nausea.-we are not at all bothered about the new drug. Also, even if the new drug can be taken into account it would rather strengthen the argument