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Women make up the majority of the population in the country, and many of the prescriptions written by doctors for tranquilizers are for women patients. The testing of these drugs for efficacy and the calibration of recommended doses, however, was done only on men. Not even the animals used to test toxicity were female.
The statements above, if true, best support which of the following as a conclusion?
(A) Some tranquilizers are more appropriately pre-scribed for women than for men.
(B) There have been no reports of negative side effects from prescribed tranquilizers in women
(C) Tranquilizers are prescribed for patients in some instances when doctors do not feel confident of their diagnoses.
(D) The toxicity of drugs to women is less than the toxicity of the same drugs to men.
(E) Whether the recommended dosages of tranquil-izers are optimal for women is not known.
答案：E