This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology, Subject name: Pathology
[{'content': 'Marker of bone resorption / Osteoclast marker is: \nSelect and explain. \nA. Alkaline phosphatase, B. Procollagen 1 N propeptide, C. C - telopeptide, D. Osteocalcin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. C-telopeptideRef: Robbins Pathology, 9th edition, page 1180Explanation:Biochemical Markers of Bone ResorptionAmino and carboxy terminal crosslinking telopeptide of bone collagen.Pyridinoline.Free lysyl-pyridinoline.Tartarate-resistant acid phosphatase (TRAP).Hydroxyproline (not very specific).', 'role': 'assistant'}]