The line $2 x - y +1=0$ is a tangent to the circle at the point $(2,5)$ and the centre of the circle lies on $x-2 y=4$. Then, the radius of the circle is
The line $2 x - y +1=0$ is a tangent to the circle at the point $(2,5)$ and the centre of the circle lies on $x-2 y=4$. Then, the radius of the circle is
- [JEE MAIN 2021]
- A
$3 \sqrt{5}$
- B
$5 \sqrt{3}$
- C
$5 \sqrt{4}$
- D
$4 \sqrt{5}$
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