If $2x^2-5xy+2y^2=0$ represents two sides of a triangle whose centroid is $(1,1)$,then the equation of the third side is

  • A
    $x+y+3=0$
  • B
    $x-y-3=0$
  • C
    $x+y-3=0$
  • D
    $x-y+3=0$

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