Regarding heart sounds

A First heart sound due to closure of atrio-ventricular valves
B Second heart sound is due to ciosure of semilunar valves
C Third heart sound occurs during period of ventricular filling
D Fourth heart sound occurs during atrial diastole
E An opening snap usually occurs due to calcified valve

Correct Answer: First heart sound due to closure of atrio-ventricular valves, Second heart sound is due to ciosure of semilunar valves, Third heart sound occurs during period of ventricular filling

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