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
Nef gene in HIV is for use - 
Select and explain. 
A. Enhancing the expression of genes, B. Enhancing viral replication, C. Decreasing viral replication, D. Maturation
C: Decreasing viral replication
Answer: C: Decreasing viral replication 
Explanation: Nef gene: Down regulates viral replication