Assertion : Birds have metanephric kidney and no urinary bladder.
Reason : South American ostrich has unary bladder .
A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true ,but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but Reason is false
D. If both Assertion and Reason are false.
