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\documentclass[pst2pdf]{webquiz}
\usepackage{pst-all,pst-3dplot}
\title{A pst2pdf example}
\begin{document}
\begin{question} % a quiz question
Which of the equations below could describe the following surface?
\begin{pspicture*}(-4,-4)(4,4)
\psplotThreeD[linecolor=blue, plotstyle=curve, drawStyle=yLines,
yPlotpoints=30, xPlotpoints=30, linewidth=1pt](-4,1)(-4,1){
x dup mul y dup mul add 1.01 exp}
\pstThreeDCoor[linewidth=1pt, xMin=-4,xMax=4,yMin=-4,yMax=4,zMin=-2,zMax=6]
\end{pspicture*}
\begin{choice}
\incorrect \( z=\log(x^2+y^2) \)
\correct \( z=e^{x^2+y^2} \)
\incorrect \( z=1-e^{x^2+y^2} \)
\incorrect \( z=\dfrac1{x^2+y^2}\)
\end{choice}
\end{question}
\end{document}
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