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: ENT
Commonest site of Ivory osteoma - 
Select and explain. 
A. Frontal-Ethmodial region, B. Mandible, C. Maxilla, D. Sphenoid
A: Frontal-Ethmodial region
Answer: A: Frontal-Ethmodial region 
Explanation: Ivory osteomas are most commonly seen in frontal sinus followed by ethmoid and maxillary sinus.