Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
A drug may affect several functions, even though it’s targeted at only one.
A. A drug is taken for a specific purpose, but it may have a range of other effects.
B. However effective a drug may be, its functions have to be several.
C. Despite various other uses, a drug usually has a function for a special effect.
D. The functions expected of a drug are various even if it is used for a specific disease.