\documentclass{webquiz}
\usepackage[dvipdfmx]{graphicx}
\DeclareGraphicsExtensions{.jpg}
\title{I am not Lion to you}
\begin{document}
  \begin{question}
    Do you recognise this Lion?
    \begin{center}
        \includegraphics[height=30mm]{ctanLion.jpg}
    \end{center}
    \begin{choice}
      \correct Yes!  \feedback This is the \TeX{} lion!
      \incorrect No! \feedback You are legally required to admire this lion!
    \end{choice}
  \end{question}
\end{document}