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Assertion: In frog, sinus venosus is pre...

Assertion: In frog, sinus venosus is present.
Reason: In mammals and birds, the remnant of sinus venosus has taken part in the formation of SA node.

A

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

B

If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.

C

If Assertion is true, but Reason is false.

D

If both Assertion and Reason are false.

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