Editor
Which of the following equation represents a hyperbola?
Difficulty: Easy
A: 
$x^{2}+y^{2}=1$
B: 
$\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1$
C: 
$\frac{x^{2}}{a^{2}}-\frac{y^{2}}{b^{2}}=1$
D: 
$y^{2} = 4ax$
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