This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Most fatal complication of measles is \nSelect and explain. \nA. Pneumonia, B. Polyps, C. SSPE, D. Otitis media', 'role': 'user'}, {'content': 'Answer: C \nExplanation: SUBACUTE SCLEROSING PANENCEPHALITIS It is a slowly progressive disease characterised by seizures and progressive deterioration of cognitive and motor function. SSPE belongs to group C slow virus infection, caused by a defective measles virus . Age: SSPE typically develops if the primary measles virus infection in childres less than 2 years of age SSPE usually develops after 7-13 years after primary measles infection. High titer antibody to measles virus in CSF is diagnostic Ref : essentials of Medical microbiology apurba sastry 1st edition page 468', 'role': 'assistant'}]