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': 'Commonest complication of mumps is - \nSelect and explain. \nA. Orchitis and oophritis, B. Encephalitis, C. Pneumonia, D. Myocarditis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Epididymo orchitis is a complication seen in about a third of post pubeal male patients. REF:ANATHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:508", 'role': 'assistant'}]