A variable circle passes through the fix...

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

A

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

B

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

C

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

D

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

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