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The circle drawn with variable chord x +...

The circle drawn with variable chord `x + ay - 5 = 0` (a being a parameter) of the parabola `y^2=20x` as diameter will always touch the line (A) `x + 5 = 0` (B) `y+ 5 = 0` (C) `x + y + 5 = 0` (D) `x-y + 5 = 0`

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