Find the differential equation of system of concentric circles with centre(1,2).

Question

$\begin{array}{1 1}(A)\;(x-1)+(y-2)\large\frac{dy}{dx}=0 \\(B)\;(x-1)-(y-2)\large\frac{dy}{dx}=0 \\ (C)\;(x+1)+(y-2)\large\frac{dy}{dx}=0 \\ (D)\;(x+1)-(y+2)\large\frac{dy}{dx}=0\end{array} $