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
Interferon interferes with replication of virus at the time of: 
Select and explain. 
A. Protein synthesis, B. DNA/RNA replication, C. When virus enters the cell, D. Uncoating of the virus protein capsule
A: Protein synthesis
Answer: A: Protein synthesis 
Explanation: Interferons are proteins that can induce a nonspecific resistance to viral infection by several mechanisms, including the inhibition of protein synthesis, inactivation of viral RNA, and enhancement of phagocytic and cytotoxic mechanisms.