If $f(x) = x^2 - x + 5, x > \frac{1}{2},$ and $g(x)$ is its inverse function,then $g'(7)$ equals

  • A
    $-\frac{1}{3}$
  • B
    $\frac{1}{13}$
  • C
    $\frac{1}{3}$
  • D
    $-\frac{1}{13}$

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