This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Cell surface markers expressed by both TH1 cells and macrophages include: \nSelect and explain. \nA. Immunoglobulin, B. CD3, C. TCR, D. MHC Class I', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. MHC Class Ia. Class I antigens are expressed on all nucleated cells and platelets.b. Hence both T helper cells and macrophages will express MHCI.', 'role': 'assistant'}]