In a circle with centre O, PQR is a tangent at the point Q on it. AB is a chord in the circle parallel to the tangent such that $$\angle$$BQR = $$70^\circ$$. What is the measure of $$\angle$$AQB ?

A

$$60^\circ$$

B

$$35^\circ$$

C

$$55^\circ$$

D

$$40^\circ$$