Question 2

In Fig. 10.11, if $TP$ and $TQ$ are the two tangents to a circle with centre $O$ so that $\angle POQ = 110^\circ$, then $\angle PTQ$ is equal to

(A) $60^\circ$    (B) $70^\circ$    (C) $80^\circ$    (D) $90^\circ$