This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Considerations - Infectious Diseases, Subject name: Pediatrics
[{'content': 'Subacute sclerosing panencephalitis is a late neurological complication associated with infection due to: \nSelect and explain. \nA. Measles virus, B. Mumps virus, C. Rubella virus, D. Parainfluenza virus', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. Measles virus(Ref: Nelson's 20/e p 1542-1547', Ghai 8/e p 213-214)Subacute sclerosing panencephalitis (SSPE) is a chronic complication of measles with a delayed onset & fatal outcome.", 'role': 'assistant'}]