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
The basic pathology in Myositis Ossificans Progressiva is in 
Select and explain. 
A. Muscle fibres, B. Serum chemistry, C. Body collagen, D. None of the above
A: Muscle fibres
Answer: A: Muscle fibres 
Explanation: A i.e. Muscle fibres