Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:If the long dark period is interrupted by flash of light in xanthium it will not flower.}\\\text{Reason:Xanthium is a long day plant in which case a continuous long light period is essential for flowering.}\end{array}$

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} $