If the bisectors of the lines $x^2 - 2pxy - y^2 = 0$ are $x^2 - 2qxy - y^2 = 0$,then

  • A
    $pq + 1 = 0$
  • B
    $pq - 1 = 0$
  • C
    $p + q = 0$
  • D
    $p - q = 0$

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