A: 'Dub' is a long and sharp sound.R: It is c | vedclass

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(D) The heart sounds are $Lubb$ and $Dub$.$Lubb$ is the first heart sound,which is low-pitched and of longer duration,caused by the closure of the atr

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Both Assertion and Reason are incorrect.

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(D) The heart sounds are $Lubb$ and $Dub$.$Lubb$ is the first heart sound,which is low-pitched and of longer duration,caused by the closure of the atrioventricular $(AV)$ valves.$Dub$ is the second heart sound,which is high-pitched and of shorter duration,caused by the closure of the semilunar valves.Therefore,the Assertion is incorrect because 'Dub' is short and sharp,and the Reason is incorrect because 'Dub' is caused by semilunar valves,not $AV$ valves.

$A$: 'Dub' is a long and sharp sound.
$R$: It is caused by the closing of atrioventricular valves.

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$A$: 'Dub' is a long and sharp sound.$R$: It is caused by the closing of atrioventricular valves.