Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R). 
Assertion (A) : The chief nitrogenous waste excreted by humans is urea.
Reason (R) : Toxic ammonia is converted to urea in the kidneys.
In the light of the above statements, choose the most appropriate answer from the options given below.

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(A) is true but (R) is false.

Both (A) and (R) are false.

Both (A) and (R) are true but (R) is not the correct explanation of (A).

Both (A) and (R) are true and (R) is the correct explanation of (A).

answer is C.

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Detailed Solution

(A) is true but (R) is false.

Humans excrete urea.
Ammonia is converted to urea in the liver, not the kidneys. The urea cycle, where toxic ammonia is converted to urea, primarily occurs in the liver, not in the kidneys.

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