In $$\triangle$$XYZ, points P, Q and R are points on the sides XY, YZ and XZ respectively $$\angle$$YXZ = 50 degree, XR = PR, ZR = QR and $$\angle$$RQZ = 80 degree. What is the value of $$\angle$$PRQ?

A

80 degree

B

90 degree

C

75 degree

D

60 degree