Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Bird's four chambered heart is superior to the four charbered heart of crocodiles .}\\\text{Reason:Crocodilian heart has both systemic arches joining resulting in mixing of blood in dorsal aorta.Avian heart has lost systemic arch.}\end{array}$

Question

$\begin{array}{1 1}(A)\;\text{Both assertion and reason are true and the reason is a correct explanation of the assertion}\\(B)\;\text{Both assertion and reason are true but reason is not a correct explanation of the assertion}\\(C)\;\text{Assertion is true but the reason is false}\\(D)\;\text{Both assertion and reason are false}\end{array}$