This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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B. Ivermectin Step 1: Understand the disease. Onchocerciasis, also known as river blindness, is a parasitic disease caused by the nematode Onchocerca volvulus*. Step 2: Evaluate the drug options for treating onchocerciasis. A. Chloroquine is an antimalarial drug. B. Ivermectin is an antiparasitic drug that is highly effective against the microfilariae of Onchocerca volvulus* and is the drug of choice for mass treatment programs for onchocerciasis. C. Metronidazole is an antibiotic and antiprotozoal drug, used for bacterial and some protozoal infections, but not onchocerciasis. D. Zidovudine is an antiretroviral drug used to treat HIV/AIDS. Step 3: Select the correct drug. Ivermectin is the drug commonly used in the mass treatment of onchocerciasis. The final answer is B. Ivermectin That's 2 down. 3 left today — send the next one.