If the conjugate of $(x+iy)(1-2i)$ is $(1+i)$,then
- A$x+iy=1-i$
- B$x+iy=\frac{1-i}{1-2i}$
- C$x-iy=\frac{1-i}{1+2i}$
- D$x-iy=\frac{1-i}{1+i}$
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