Ans: D
$\begin{array}{rcl}
\sin\theta & = & \sqrt{3} \cos \theta \\
\dfrac{\sin\theta}{\cos\theta} & = & \sqrt{3} \\
\tan\theta & = & \sqrt{3} \\
\theta & = & 60^\circ
\end{array}$
$\begin{array}{rcl}
\sin\theta & = & \sqrt{3} \cos \theta \\
\dfrac{\sin\theta}{\cos\theta} & = & \sqrt{3} \\
\tan\theta & = & \sqrt{3} \\
\theta & = & 60^\circ
\end{array}$
