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If $\cot \theta = \frac{p}{q}$ ($q \neq 0$), then $\sin \theta$ is equal to :
- (a)$\frac{p}{\sqrt{p^2 + q^2}}$
- (b)$\frac{\sqrt{p^2 + q^2}}{p}$
- (c)$\frac{q}{\sqrt{p^2 + q^2}}$
- (d)$\frac{q}{\sqrt{p^2 - q^2}}$
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(C) $\frac{q}{\sqrt{p^2 + q^2}}$