If $y = x + {1 \over x}$, then
- A${x^2}{{dy} \over {dx}} + xy = 0$
- B${x^2}{{dy} \over {dx}} + xy + 2 = 0$
- C${x^2}{{dy} \over {dx}} - xy + 2 = 0$
- DNone of these
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- [AIPMT 2003]