Editor
The equation of the parabola having its focus at the origin and directrix is parallel to y-axis is:
Difficulty: Easy
A: 
$x^{2}=-2a(y-\frac{a}{2})$
B: 
$x^{2}=-2ax$
C: 
$x^{2}=-2ay+\frac{a^{2}}{2}$
D: 
$x^{2}=-2a(x-\frac{a}{2})$
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