The first heart sound is produced by the_____________?

A.\tClosure of the aortic and pulmonary valves

B.\tOpening of the aortic and pulmonary valves

C.\tClosure of the mitral and tricuspid valvesCorrect Answer

D.\tOpening of the mitral and tricuspid valves

Correct Option: C.\tClosure of the mitral and tricuspid valves

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