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
Virus lacking hemagglutinin and neuraminidase but having membrane fusion protein is ? 
Select and explain. 
A. RSV, B. CMV, C. HSV, D. EBV
A: RSV
Answer: A: RSV 
Explanation: Ans. is 'a' i.e., RSV RSV does not posses hemagglutinin or neuraminidase. . The viral envelope has two glycoproteins? i) G protein --> By which virus attaches to cell surface ii) F- protein ( Fusion protein) -->which bring about fusion between viral and host cell membranes. It is also responsible for cell to cell fusion, which leads to characteristic syncytial formation.