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': 'A most serious complication of measles is- \nSelect and explain. \nA. Koplik spots, B. Parotitis, C. Meningoencephalitis, D. Nephritis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Neurological complications are more severe, e.g., febrile convulsions, encephalitis, and SSPE.', 'role': 'assistant'}]