Correct Answer:
B. Sphygmomanometer
The instrument used to measure blood pressure is a sphygmomanometer. It consists of an inflatable cuff, a measuring unit (mercury or aneroid manometer), and a mechanism for inflation. Therefore, the correct option is B: Sphygmomanometer.
- A: Thermometer measures temperature.
- C: Barometer measures atmospheric pressure.
- D: Stethoscope is used to listen to internal sounds of the body, such as heartbeats and breathing, but does not directly measure blood pressure.