This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
Most common benign tumor of paranasal sinuses? 
Select and explain. 
A. Papilloma, B. Osteoma, C. Warts, D. Fibroma
B: Osteoma
Answer: B: Osteoma 
Explanation: Ans. is 'b' i.e., Osteoma * Osteoma of the frontal sinus - Most common benign tumour arising in the nasal sinuses.* The osteoma arises from the floor of the frontal sinus near the midline.