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: Surgery
[{'content': 'In traumatic myostis ossificans, following are true except: \nSelect and explain. \nA. Hydroxyapatite deposition, B. Common in elbow injury, C. Periosteal hematoma & leakage, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Hydroxypatite deposition', 'role': 'assistant'}]