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
Rinne’s test was negative in the right ear. Possible diagnosis is 
Select and explain. 
A. 40 db SNHL in left ear, right ear normal, B. 40 db CHL right ear, left ear normal, C. 40 db CHL both ear, D. Profound hearing loss right ear, left ear normal
B: 40 db CHL right ear, left ear normal
Answer: B: 40 db CHL right ear, left ear normal 
Explanation: There is a conductive hearing loss in the right ear.
Left ear normal.  

A prediction of an air-bone gap can be made if tuning forks of 256, 512 and 1024 Hz are used.

A Rinne test equal or negative for 256 Hz but positive for 512 Hz indicates an air-bone gap of 20–30 dB.
A Rinne test negative for 256 and 512 Hz but positive for 1024 Hz indicates an air-bone gap of 30–45 dB.
A Rinne negative for all the three tuning forks of 256, 512 and 1024 Hz indicates an air-bone gap of 45–60 dB.