Assertion: Ammonia is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions. 
Reason: Ammonia is readily soluble in water.

Options

A. if both assertion and reason are true and the reason is correct explanation of the assertion
B. if both assertion and reason are true but reason is not a correct explantion of the assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

A

Explanation

Ammonia, as it is readily soluble, is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions. Kidneys do not play any significant role in its removal.