If $x^y=y^x$,then $x(x-y \log x) \frac{d y}{d x}$ is equal to :

  • A
    $y(y-x \log y)$
  • B
    $y(y+x \log y)$
  • C
    $x(x+y \log x)$
  • D
    $x(y-x \log y)$

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