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
The virus HIV is produced and propagated in: 
Select and explain. 
A. Dendritic cells of the lymphnode germinal epithelium, B. Circulating T4 lymphocytes, C. B- lymphocytes, D. Epithelial cells of the sex organs
B: Circulating T4 lymphocytes
Answer: B: Circulating T4 lymphocytes 
Explanation: None