This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy and physiology of bone and fracture healing, Subject name: Orthopaedics
Indicators of bone formation includes all of following except 
Select and explain. 
A. Osteocalcin, B. Alkaline phosphatase, C. Hydroxyproline, D. Type 1 procollegen
C: Hydroxyproline
Answer: C: Hydroxyproline 
Explanation: Markers of bone formation:Serum bone specific alkaline phosphatase * Serum osteocalcin * Serum peptide of type 1 collagen Markers of bone resorption:Urine and serum crosslinked &;N&; telopeptidase * Urine and serum crosslinked &;C&; telopeptidase * Urine total free deoxypyridinoline ref: maheswari,9th edition , page no.12