The major reason why there are fewer antiprotozoal drugs than antibacterial drugs is because ________.
A. antiprotozoal drugs cost much more than antibacterial drugs to develop
B. antiprotozoal drugs are only effective when injected
C. it is much more difficult to develop selectively toxic antiprotozoal drugs since protozoan cells are eukaryotic
D. antiprotozoal drugs are not needed in the United States
Answer: C
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