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
Whicn is not a marker of new bone formation? 
Select and explain. 
A. Alkaline phosphatase, B. Osteocalcin, C. Urine hydroxyproline, D. Pro collagen
C: Urine hydroxyproline
Answer: C: Urine hydroxyproline 
Explanation: C i.e. Urine hydroxyl proline