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: Pathology
[{'content': "Bell's palsy is triggered by \nSelect and explain. \nA. Exposure to Cold, B. Tooth extraction, C. Local and systemic infection, D. Any of the above", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]