This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ENT Q Bank, Subject name: ENT
Surfer's ear differs from Osteoma in that it is : 
Select and explain. 
A. Unilateral, B. Single, C. Sessile, D. Seen in cailaginous canal
C: Sessile
Answer: C: Sessile 
Explanation: Exostosis is bilateral multiple smooth sessile bony swellings in the deeper canal seen in divers/swimmer's/Surfer's. It is called Surfer's ear. Osteoma Exostosis/Surfer's Ear Single Multiple Unilateral Bilateral Pedunculated, hard Sessile, smooth Outer canal Inner, deeper canal