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Read the following statements carefully ...

Read the following statements carefully and select correct choice from below:
(a) First heart sound lub is produced due to closure of atrioventricular valves,
(b) First heart sound is of longer duration than second heart sound dub.

A

(a) is correct but (b) is wrong

B

(b) is correct but (a) is wrong

C

Both (a) and (b) are brrect

D

Both (a) & (b) are wrong

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