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': 'Subacute sclerosing pan-encephalitis is associated with - \nSelect and explain. \nA. Mumps, B. Measles, C. Rubella, D. Typhoid', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Measles", 'role': 'assistant'}]