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A variable circle passes through the fix...

A variable circle passes through the fixed point ` A(p,q)` and touches the x-axis. The locus of the other end of the diameter through A is-

A

`(x-p)^2 = 4qy`

B

`(x-q)^2 = 4py`

C

`(y-p)^2 = 4qx`

D

`(y-q)^2 = 4px`

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