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
Red line in pure tone audiometry is for - 
Select and explain. 
A. Bone conduction, B. Air conduction, C. Right ear, D. Left ear
C: Right ear
Answer: C: Right ear 
Explanation: Ans. is 'c' i.e., Right ear