In a circle with centre O, chords PR and QS meet at the point T, when produced, and PQ is a diameter. If $$\angle ROS = 42^{\circ}$$ then the measure of $$\angle$$ PTQ is

A

$$59^{\circ}$$

B

$$58^{\circ}$$

C

$$48^{\circ}$$

D

$$69^{\circ}$$