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A variable circle passes through the fix...

A variable circle passes through the fixed point A(p, q) and touches 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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The correct Answer is:
A
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