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Which instrument is used to listen to the Korotkoff sounds?

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Which instrument is used to listen to the Korotkoff sounds?

(a) Stethoscope

(b) Pneumotachometer

(c) Piezoelectric Microphone

(d) Sphygmomanometer

This question was posed to me in an interview for internship.

Question is taken from Measuring Blood Pressure & Pulse Oximetry topic in portion Diagnostic Investigation in Neurology and Cardiology of Clinical Science

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The correct option is (c) Piezoelectric Microphone

Easiest explanation: Korotkoff sounds are heard while BP is measured using a cuff. The microphone is placed on the brachial artery, near the inner side of the elbow (antecubital fossa).  The cuff is inflated to a [reset pressure level, around up to 30mmHg/s. The pressure is then released at around 3 – 5 mmHg/s. When the air is leaking out, Korotkoff sounds are heard. When the first Korotkoff sound (systolic) is heard, the system starts recording and when the last Korotkoff sound (diastolic) is heard, the system stops recording. The cuff gets completely deflated with 2 – 3 seconds after the last sound is heard.

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