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Let the lengths of intercepts on x-axis ...

Let the lengths of intercepts on x-axis and y-axis made by the circle `x^(2)+y^(2)+ax+2ay+c=0,(alt0)` be `2sqrt2` and `2sqrt5`, respectively. Then the shortest distance from origin to a tangent to this circle which is perpendicular to the line x+2y=0 is equal to :

A

`sqrt7`

B

`sqrt6`

C

`sqrt10`

D

`sqrt11`

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