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
In traumatic myostis ossificans, following are true except: 
Select and explain. 
A. Hydroxyapatite deposition, B. Common in elbow injury, C. Periosteal hematoma & leakage, D. All
A: Hydroxyapatite deposition
Answer: A: Hydroxyapatite deposition 
Explanation: A i.e. Hydroxypatite deposition