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': 'Cyclosporin–A acts on \nSelect and explain. \nA. CD4 cells, B. CD3 cells, C. CD8 cells, D. B lymphocytes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]