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I^(st) Heart Sound is due to :...

`I^(st)` Heart Sound is due to `:`

A

Closure of Smiunar value

B

Closure of Pulmonary & Aortic Valve

C

Vibration just after Closure of Mitral & Tricuspid valuve

D

Vibration after Closure of Pulmonary & Aortic Valve

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