A study done last year argued that doctors tend to ignore

A study done last year argued that doctors tend to ignore women's health complaints and prescribe painkillers instead of seeking to determine the underlying cause of the complaints.
The study showed that women are twice as likely as men to receive a painkiller prescription after visiting a physician. Statistics, however, show that men accounted for fully half of all painkillers prescriptions. Evidently, last year's study was inaccurate.

Which of the following, if true, would cast the most doubt on the argument above?

A) Men are more likely than women to require serious medical treatment

B) Last year, 75 percent of the prescriptions written were written for male patients

C) Studies done in the last few years show that symptoms once thought to be psychosomatic may in fact have physical origins.

D) Because of their different metabolisms, men and women are usually given different dosages of medication

E) Women's health complaints are often assumed to have psychosomatic origins, for which the prescription of low dosages of painkillers is standard practice

This was extracted from some Kaplan study book.
Answer? Explanations?