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': 'The disease diagnosed from the following CT follows an attack of: \nSelect and explain. \nA. Measles, B. Varicella, C. Mumps, D. Rubella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: SSPE as not a common but rare complication of measles (Febrile convulsions, Encephalitis and SSPE are rare complications)', 'role': 'assistant'}]