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
Keratosis obturans is - 
Select and explain. 
A. Foreign body in external auditory canal, B. Desquamated epithelial cell + Cholesterol, C. Cholesterol crystals surrounded by calcium, D. Wax in external auditory canal
B: Desquamated epithelial cell + Cholesterol
Answer: B: Desquamated epithelial cell + Cholesterol 
Explanation: None