\documentclass[svgnames]{webquiz}
\usepackage{pst-all}
\newcommand\C{\mathbb{C}}
\title{A pstricks example}
\begin{document}
  \begin{question}
     The shaded region in the graph
     \begin{center}
       \begin{pspicture}[unit=0.6cm](-3,-1.5)(3,4)
         \pscircle[linewidth=1pt,linestyle=dashed,
                   fillcolor=SkyBlue,fillstyle=solid](1,1){2}
         \psaxes[linecolor=red,linewidth=1pt,labels=none]
                    {->}(0,0)(-1.5,-1.5)(3.5,3.5)
         \rput(3.75,0){$x$}  \rput(0,3.85){$iy$}
         \rput(3,-0.4){3}    \rput(-0.4,3){3$i$}
         \psdots(1,1)
       \end{pspicture}
     \end{center}
     is equal to which of the following sets of complex numbers?
     \begin{choice}[columns=2]
       \incorrect $\{z \in \C : (z-1)^{2}+(z-(i+1))^{2}<2\}$
       \incorrect $\{z \in \C : z+(i+1)<2\}$
       \correct   $\{z \in \C : |z-(i+1)|<2\}$
       \incorrect None of the above.
     \end{choice}
   \end{question}
\end{document}
