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 common viral disease affecting parotid glands - \nSelect and explain. \nA. Mumps, B. Measles, C. Rubella, D. Varicella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: an acute infection commonly affecting children and characterised by non suppurative enlargement of parotid gland REF:ANANTHANARYANAN TEXT BOOK OF MICROBIOLOGY 9EDITION PGNO.507', 'role': 'assistant'}]