This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology Pa-2 (RNA Virus Pa-1,2 & Miscellaneous Viruses), Subject name: Microbiology
The paramyxovirus virus that lacks both hemagglutinin and neuraminidase activities is: 
Select and explain. 
A. Mumps virus, B. Measles virus, C. Respiratory syncytial virus, D. Parainfluenza virus.
C: Respiratory syncytial virus
Answer: C: Respiratory syncytial virus 
Explanation: 1. Influenza and mumps possess both haemagglutinin and neuraminidase spikes. 2. Measles possesses haemagglutinin but lacks neuraminidase spikes. 3. RSV lacks both haemagglutinin and neuraminidase spikes. The viral envelope contains a surface glycoprotein G, by which it is attached to the cell surface of the host cells. It contains F protein but lacks both H and N proteins. The F protein induces the fusion of the infected cells with adjoining cells, resulting in the formation of large multinucleated syncytia, from which the virus derives its name.