This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous ENT, Subject name: ENT
[{'content': 'Commonest site of Ivory osteoma is \nSelect and explain. \nA. Frontal-Ethmodial region, B. Mandible, C. Maxilla, D. Spheroid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Osteoma: They are most commonly seen in the frontal sinus followed in turn by those of ethmoid and maxillary. They may remain asymptomatic, being discovered incidentally on X-rays. Ref: Textbook of ENT, Dhingra; 6th edition; Pg no: 205 ref img', 'role': 'assistant'}]