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