Which of the following is used for hearing the sound of heart and lungs?

A. Steroscope
B. Stethoscope
C. Oscillator
D. Oncolator

The stethoscope is an instrument used for auscultation, or listening to sounds produced by the body. It is used primarily to listen to the lungs, heart, and intestinal tract. It is also used to listen to blood flow in peripheral vessels and the heart sounds of develog fetuses in pregnant women.