This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
What is the Diagnosis? 
Select and explain. 
A. Otitis exterena, B. Exostosis, C. Keratosis obturans, D. Cerumen
B: Exostosis
Answer: B: Exostosis 
Explanation: .