This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
The most common site of osteoma is 
Select and explain. 
A. Maxillary sinus, B. Ethmoidal sinus, C. Frontal sinus, D. Sphenoidal sinus
C: Frontal sinus
Answer: C: Frontal sinus 
Explanation: The commonest site of osteoma in the PNS is frontal sinus.Commonest benign tumor of PNS is an osteomaMost common benign tumor of the nose is capillary hemangioma (nasal septum)Gardner`s syndrome- Colonic polyposis, multiple soft tissue swellings, and facial osteomas(Autosomal Dominant hereditary defect of connective tissue)Ref: Hazarika; 3rd ed; Pg 370