If the vertex and focus of a parabola lying on the $x$-axis are at distances $p$ and $q$ from the origin respectively,find its equation.
- A$y^2 = -4(p - q)(x + p)$
- B$y^2 = 4(p - q)(x - p)$
- C$y^2 = -4(p - q)(x - p)$
- DNone of these
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