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Let O be the origin and OP and OQ be the...

Let O be the origin and OP and OQ be the tangents to the circle `x^2+y^2-6x+4y+8=0` at the points P and Q on it. If the circumcircle of the triangle OPQ passes through the point `(alpha,1/2)` , then a value of `alpha` is

A

`3/2`

B

`-1/2`

C

`5/2`

D

1

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