Find the radian measure of $-37^{\large\circ}30'$

Question

$\begin{array}{1 1}(A)\;(\large\frac{-5\pi}{24})^c\\(B)\;(\large\frac{5\pi}{24})^c\\(C)\;(\large\frac{7\pi}{24})^c\\(D)\;(\large\frac{-7\pi}{24})^c\end{array}$