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At point 'P' on a circle, PQ is a tangen...

At point 'P' on a circle, PQ is a tangent and 'O' is the centre of the circle. If `triangleOPQ` is an isosceles triangle, then `/_OQP` is equal to

A

`90^@`

B

`30^@`

C

`45^@`

D

`60^@`

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