This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Korotkoff sound is produced due to 
Select and explain. 
A. Stream line flow of blood, B. Increase in viscosity of blood, C. Murmur, D. Turbulent flow of blood
D: Turbulent flow of blood
Answer: D: Turbulent flow of blood 
Explanation: When the cuff pressure is great enough to close the aery during pa of the aerial pressure cycle, a sound is then heard with each pulsation. These sounds are called Korotkoff sounds, named after Nikolai Korotkoff, a Russian physicianRef: Guyton and Hall textbook of medical physiology 13th edition. Page:182