<prompt> Audiogram in early Menieres disease shows:Notch at 2 kHz in bone conductionNotch at 4 kHz in air conductionA flat curveA rising curve  <response>: In early cases of Menieres disease low frequencies are affected more and the audiogram shows a rising curve. In long-standing cases, audiogram becomes fiat and then falling type.Notch at 2 kHz in bone conduction is typically seen in Carharts notch seen in otosclerosis 5 dB at 500 Hz, 10 dB at 1000 Hz, 15 dB at 2000 and 5 dB at 4000 Hz.Notch at 4 kHz both in air and bone conduction is seen in noise-induced hearing loss. As the duration of noise exposure increases, notch at 4 kHz deepens and widens to involve other frequencies. 