Assertion : Urea is a less toxic excretory substance comparatively to uric acid
Reason : Birds and insects are uricotellic animals .
A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and the reason are true and the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If the assertion is false but reason is true