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: Medicine
All of the following are recognised tumor-markers except - 
Select and explain. 
A. Beta HCG, B. Beta 2 microglobin, C. Acid phosphatase, D. Alpha foeto protein
B: Beta 2 microglobin
Answer: B: Beta 2 microglobin 
Explanation: None