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: Unknown
[{'content': 'Thalidomide is drug of choice for - \nSelect and explain. \nA. Lepra I reaction, B. Lepra II reaction, C. Both, D. Nerve abscess', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans-B', 'role': 'assistant'}]