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: Social & Preventive Medicine
[{'content': 'Most common cause of death due to measles is \nSelect and explain. \nA. Pneumonia, B. Secondary bacterial infection, C. Measles encephalitis, D. Otitis media', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]