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: Orthopaedics
[{'content': 'Most common site of origin of adamantinoma is - \nSelect and explain. \nA. Mandible near molar tooth, B. Middle alveolar margins, C. Hard palate, D. Mandible near symphisis menti', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ameloblastoma occurs most often in the mandible in the area of the molars.\nIt is an epithelial tumor arising from ameloblast (enamel-forming cells).\nPathologically it behaves like a basal cell carcinoma i.e., it is a malignant tumour which is locally invasive but does not metastasize.\nIt causes expansion mostly of the outer table so the swelling is more evident from outside than from inside of the mouth.\nCystic degeneration leads to an area of softening and egg - shell crackling on palpation.', 'role': 'assistant'}]