What should be CMRR of preamplifier upto 5 Khz?

What should be CMRR of preamplifier upto 5 Khz? Correct Answer greater than 90 dB

The common-mode rejection should be greater than 90 dB up to 5 kHz. A calibrating square wave signal of 100 mV (peak-to-peak) at a frequency of 100 Hz is usually available. The main amplifier has controls for gain adjustment from 5 mV/div to 10 mV/div for selecting the sensitivity most appropriate to the incoming signal from the patient.
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