This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
About interferon true is - 
Select and explain. 
A. It is a synthetic antiviral agent, B. Inhibits viral replication in cells, C. Is specific for a paicular virus, D. None
B: Inhibits viral replication in cells
Answer: B: Inhibits viral replication in cells 
Explanation: interferon any of a group of proteins produced by cells in the body in response to an attack by a virus A cell infected by a virus releases minute amounts of interferons, which attach themselves to neighboring cells,prompting them to sta producing their own protective antiviral enzymes. The result is impairment of the growth and replication of the attacking virus. ref: Ganong's Review of Medical physiology; 24th edition; page no:54