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': 'Virus lacking hemagglutinin and nuraminidase but have membrane fusion protein is: \nSelect and explain. \nA. RSV, B. CMV, C. HSV, D. Ebestein Barr virs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. RSV', 'role': 'assistant'}]