**Solution:**

**The line** drawn from the **centre of the circle** to the **tangent** is perpendicular to the tangent.

∴ OP ⊥ PQ

By **Pythagoras theorem** in ΔOPQ,

OQ^{2} = OP^{2} + PQ^{2}

⇒ (12)^{2} = 5^{2} + PQ^{2}

⇒PQ^{2} = 144 - 25

⇒PQ^{2} = 119

⇒PQ = √119 cm

So, (D) is the right option.