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
Cell surface markers expressed by both TH1 cells and macrophages include: 
Select and explain. 
A. Immunoglobulin, B. CD3, C. TCR, D. MHC Class I
D: MHC Class I
Answer: D: MHC Class I 
Explanation: 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.