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
Which of the following is not a tumor marker - 
Select and explain. 
A. CEA, B. Tyrosinase, C. Human leucocyte antigen A2, D. AFP
C: Human leucocyte antigen A2
Answer: C: Human leucocyte antigen A2 
Explanation: None