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: Pathology
Antibody against tumor cells - 
Select and explain. 
A. MHC-I, B. MHC-II, C. Anti viral, D. Differentiated antigen
A: MHC-I
Answer: A: MHC-I 
Explanation: None