Gain = Correction/Error Cold exposure causes body temperature to fall from 37 to 36.5degC in presence of thermoregulatory system, so error is 37-36.5=0.5degC If thermoregulatory system would not be working the body temperature would have become 20degC. But due to thermoregulatory system body temperature was 36.5degC on exposure to cold. So, the correction done by thermoregulatory mechanisms: 36.5-20=16.5degC Gain = 16.5/0.5 = 33