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: Microbiology
[{'content': 'Which virus may produce incomplete progeny ? \nSelect and explain. \nA. Influenza, B. Measles, C. Mumps, D. Polio', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Influenza When cells are infected with high dose of influenza virus, there is defective asembly during replication and the progeny virons are imcomplete and non-infective.This is called as Man - magnus phenomenon", 'role': 'assistant'}]