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: Surgery
Specific marker for prostatic cancer is - 
Select and explain. 
A. Alkaline phosphatase, B. Prostate specific antigen, C. Acid phosphatase, D. CA 125
B: Prostate specific antigen
Answer: B: Prostate specific antigen 
Explanation: None