Assertion:main constituent of human urine is ammonia
Reason: if human urine is allowed to stand for some time, it smell strongly of ammonia .
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 the assertion is true but reason is false
D. If the assertion is false but reason are false .
