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
[{'content': 'Rate of newly synthesized osteoid mineralization can be best estimated by \nSelect and explain. \nA. Tetracycline labeling, B. Alizarin red stain, C. Calcein stain, D. Van kossa stain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rate of mineralisation is determined by Labelled Tetracycline. ref:maheswari,5th edition page no.12', 'role': 'assistant'}]