Medicinal chemists that synthesize drugs to kill pathogenic protozoans aim to target a novel mechanism to promote selective toxicity. The reason there are fewer antiprotozoal drugs compared to antibacterials is that ________.
A. there are few novel molecular mechanisms in protozoa compared to human hosts since both are eukaryotes, so toxicity is an issue
B. protozoans are not pathogenic compared to bacteria so developing drugs is not cost-effective
C. most antiprotozoal drugs also kill bacteria so they are not given their own category
D. targeting novel mechanisms in protozoans is far more costly than it is for bacterial cells
Answer: A
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