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
All of the following are examples of tumor markers, except: 
Select and explain. 
A. Alpha-HCG (?-hCG), B. Alpha-Feto protein, C. Thyroglobulin, D. ?2 microglobulin
A: Alpha-HCG (?-hCG)
Answer: A: Alpha-HCG (?-hCG) 
Explanation: . Alpha-HCG (I+--hCG)