\documentclass[a4paper]{article}
\usepackage[correc]{automultiplechoice}

\geometry{left=15mm,right=15mm}
\begin{document}

\begin{examcopy}[36]
  \begin{question}{bop}
  BiBop

  \begin{choices}
    \correctchoice{Good answer}\explain{Why it's true.}

    \wrongchoice{Wrong answer}\explain{Why it's wrong.}

    \wrongchoice{Another wrong answer}\explain{Another explanation.}
  \end{choices}
 \end{question}
\end{examcopy}


\end{document}
