Find the Exact Value of the Expression Using the Provided $\sin \theta$

Multiple Choice

Find the exact value of the expression using the provided information.
-Find $\sin \theta$ if $\tan \theta = - \frac { 12 } { 5 }$ and $\cos \theta > 0$ .

A) $- \frac { 5 } { 13 }$
B) $\frac { 5 } { 13 }$
C) $- \frac { 13 } { 12 }$
D) $- \frac { 12 } { 13 }$