If $x^py^q=(x+y)^{p+q}$,then $\frac{dy}{dx}=$

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

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