Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Lymphocytes arise in the bone marrow and differentiate in the bursal lymphoid tissues or in the thymus into B-cells and T-cells.}\\\text{Reason:B-cells and T-cells are prepared for providing humoral and cell-mediated immunity.}\end{array}$

Question

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