This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, 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: Alkaline phosphatase is a marker for bone tumors. Basic Pathology, Robbins. Page no.: 770