If $x y \neq 0, x+y \neq 0$ and $x^m y^n=(x+y)^{m+n}$, where $m, n \notin N$, then $\frac{d y}{d x}$ is equal to

  • A
    $\frac{y}{x}$
  • B
    $\frac{x+y}{x y}$
  • C
    $x y$
  • D
    $\frac{x}{y}$

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