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If the tangent at the point P on the circle $x^2+y^2+6x=2$ meets a straight line $5x-2y+6=0$ at a point Q on the y-axis , then the length of $PQ$ is

$\begin{array}{1 1}(A)\;4\\(B)\;2 \sqrt 5\\(C)\;5 \\(D)\;3 \sqrt 5 \end{array}$

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