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
Human immunodeficiency virus (HIV) affects: 
Select and explain. 
A. Red blood cells, B. Fibroblasts, C. Helper T lymphocytes (CD4), D. Mast cells
C: Helper T lymphocytes (CD4)
Answer: C: Helper T lymphocytes (CD4) 
Explanation: None