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
[{'content': 'AIDS is a disease of the immune system primarily affecting \nSelect and explain. \nA. Granulocytes, B. Immunoglobulins, C. Opsonins, D. T Lymphocytes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]