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': 'The basic pathology in Myositis Ossificans Progressiva is in \nSelect and explain. \nA. Muscle fibres, B. Serum chemistry, C. Body collagen, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Muscle fibres', 'role': 'assistant'}]