This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Scabies can be effectively treated systemically by : \nSelect and explain. \nA. Psoralens, B. Ivermectin, C. Permethrin, D. Cotrimoxazole', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]