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Q.) If x, y ∈ R satisfy the equation x² + y²-4x-2y+5=0, then the value of the expression [(√x− y^.5)²+4√xy)]/(x+(xy)^.5) is
[A]√2+1
[B]√2+1 /2
[C]√2-1 /2
[D]√2+1/ √2