The value of $\tan 1^{\large\circ}\tan 2^{\large\circ}\tan 3^{\large\circ}$........$\tan 89^{\large\circ}$ is

Question

$\begin{array}{1 1}(A)\;0&(B)\;1\\(C)\;\large\frac{1}{2}&(D)\;\text{Not defined}\end{array}$