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': 'The following site is commonly involved in cases of Myositis ossiﬁcans: \nSelect and explain. \nA. Masseter, B. Hyoglossus, C. Stylohyoid, D. Lateral pterygoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Myositis ossiﬁcans manifests by masses of ﬁbrous tissue and bone in the interstitial tissues of muscle,\xa0leading to atrophy and destruction of associated muscles. Masseter is commonly involved in face and\xa0ﬁxation of jaw occurs. The patient becomes transformed into rigid, like a "petriﬁed man\'.', 'role': 'assistant'}]