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 a tumor marker ? 
Select and explain. 
A. Acid hydrolase, B. Alkaline phosphatase, C. Melatonin, D. CPK-MB
B: Alkaline phosphatase
Answer: B: Alkaline phosphatase 
Explanation: Ans. is 'b' i.e., Alkaline phosphatase Placental alkaline plosphatase is marker of seminoma. But specificity is very low.