Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because

Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because 










A. humans do not use folic acid.
B. humans do not synthesize folic acid but obtain it in their diets.
C. humans synthesize folic acid by a process that is not sensitive to sulfonamides.
D. none of these















Answer: B


Microbiology

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