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': 'Osteosarcoma of the jaw: \nSelect and explain. \nA. Occurs mostly in the maxilla, B. Seen in old age, C. Highly malignant tumour which shows early metastasis, D. Shows a soap bubble type of radiolucency in radiographs', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]