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: Pharmacology
AIDS is a disease of the immune system primarily affecting 
Select and explain. 
A. Granulocytes, B. Immunoglobulins, C. Opsonins, D. T Lymphocytes
D: T Lymphocytes
Answer: D: T Lymphocytes 
Explanation: None