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 overall effect of HIV is to gradually impair the immune system by interference with 
Select and explain. 
A. Helper T lymphocytes, B. Natural killer cells, C. Plasma cells, D. Macrophages
A: Helper T lymphocytes
Answer: A: Helper T lymphocytes 
Explanation: None