The line 2 x - y + 1 = 0 is tangent to ...

The line ` 2 x - y + 1 = 0` is tangent to the circle at the point (2,5) and the center of the circle lies on ` x - 2y = 4` . The radius of the circle is

A

`3 sqrt(5)`

B

`5 sqrt(3)`

C

`2 sqrt(5)`

D

`5 sqrt(2)`

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The correct Answer is:

A

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