The value of $\sin\large\frac{\pi}{10}$$\sin\large\frac{13\pi}{10}$ is

Question

$\begin{array}{1 1}(A)\;\large\frac{1}{2}&(B)\;\large\frac{-1}{2}\\(C)\;\large\frac{-1}{4}&(D)\;1\end{array} $