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
Surfer's ear is 
Select and explain. 
A. Exostosis, B. Otosclerosis, C. Otitis externa, D. Squamous cell Ca
A: Exostosis
Answer: A: Exostosis 
Explanation: None