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: Pathology
[{'content': 'Myositis ossificans is differentiated from other reactive fibroblastic proliferations by the presence of:September 2009 \nSelect and explain. \nA. Dysplastic bone, B. Dystrophic bone, C. Metaplastic bone, D. Hyperophic bone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Metaplastic boneMyositis ossificans usually develops in the athletic adolescents and young adults and follows an episode of trauma in more than 50% of cases.The lesion typically arises in the musculature of proximal extremities.It shows metaplastic bone.It should be differentiated from extraskeletal osteosarcoma.', 'role': 'assistant'}]