This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Drug of choice in the treatment of onchocerciasis is \nSelect and explain. \nA. DEC, B. Ivermectin, C. Ketoconazole, D. Cotrimoxazole', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Ivermectin # Ivermectin, a semisynthetic macrocyclic lactone active against microfilariae, is the first-line agent for the treatment of onchocerc asis.> It is given orally in a single dose of 150 pg/kg, either yearly or semiannually.', 'role': 'assistant'}]