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: Medicine
[{'content': "Most common cause of LMN facial palsy is - \nSelect and explain. \nA. Disseminated sclerosis, B. Bell's palsy, C. DM, D. Leprosy", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]