If $$\cos \theta = \frac{-5}{13}$$ and $$\theta$$ is not in $$3^{rd}$$ quadrant, then $$\tan \frac{\theta}{2}$$ =

A

$$-\frac{3}{2}$$

B

$$\frac{3}{2}$$

C

$$\frac{2}{3}$$

D

$$-\frac{2}{3}$$