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Assertion :- In fish ammonia is excreted...

Assertion `:-` In fish ammonia is excreted by diffusion through gill surface as ammonium ions.
Reason `:-` Some amount of urea may be retained in the kidney matrix of some animals to maintain a desired osmolarity.

A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .

B

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion

C

If Assertion is True but the Reason is False.

D

If both Assertion & Reason are false.

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