In Bing test on alternately compressing and relaxing the tragus the sound increases and decreases. This indicates:: (A) SN deafness, (B) Adhesive otitis media, (C) Otosclerosis, (D) CSOM
Answer is A. (a) SN deafness(Ref. Scott Brown, 8th ed., Vol 2; 927)The other options being conductive pathologies so show no change in hearing.