The instrument used to hear heart beat is

Electrocardiograph

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Sphygmomanometer

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Stethoscope

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Haemometer

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Solution

The correct option is C Stethoscope
During each cardiac cycle, two prominent sounds are produced which can be easily heard through a stethoscope. The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves. These sounds are of clinical diagnostic significance.

So, the correct answer is option C.

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