Identify the instrument used to examine the heartbeat of a person.

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Solution

The correct option is B
A stethoscope is a device or instrument used to examine and measure the heartbeat of a person. Heartbeat is the number of times the heart of a person is beating (making sound) in one minute. It looks like this:
The doctor puts the two ear-tips into the ears, and the chest-piece is placed on the patient's heart to hear the heartbeat.

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