<prompt> Korotkoff sound is produced due toStream line flow of bloodIncrease in viscosity of bloodMurmurTurbulent flow of blood  <response>: 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 