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: Orthopaedics
Indicators of bone formation include all of the 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 

Bone-specific alkaline phosphatase
Osteocalcin
Serum peptide of type I procollagen / Type I collagen extension peptide