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
Primary receptor cells of hearing- 
Select and explain. 
A. Supporting cell, B. Tectorial membrane, C. Tunnel of corti, D. Hair cell
D: Hair cell
Answer: D: Hair cell 
Explanation: Hair cells: are important receptor cells of hearing and transduce sound energy into electrical energy.