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: Unknown
This tumour arises from: 
Select and explain. 
A. Epitympanum, B. Hypotympanum, C. Mesotympanum, D. Inner ear
B: Hypotympanum
Answer: B: Hypotympanum 
Explanation: None