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
[{'content': 'Indicators of bone formation include all of the following except - \nSelect and explain. \nA. Osteocalcin, B. Alkaline phosphatase, C. Hydroxyproline, D. Type 1 procollegen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Markers of bone formation \n\nBone-specific alkaline phosphatase\nOsteocalcin\nSerum peptide of type I procollagen / Type I collagen extension peptide', 'role': 'assistant'}]