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\label{Authoring_RadiobuttonResponse}\index{radiobuttonresponse}

\textbf{radiobuttonresponse} implements a true/false question with
one correct answer. It uses the foil structure tags as described in
\ref{Authoring_Foil_Structure_Tags}, but the \emph{value} of a foil can only
be \textbf{true}, \textbf{false}, or \textbf{unused}.
It is possible to use a Perl variable for the value attribute, as long as it can only have a valid value.

Several true foils can be specified, but only one (randomly chosen) will be displayed.

Possible attributes for \texttt{<radiobuttonresponse>} are:
\begin{itemize}
  \item \textbf{max}: the maximum number of foils displayed at once
  (if more are specified, some will not be displayed)
  \item \textbf{randomize}: set to \texttt{yes} to randomize the order of foils when displayed
  \item \textbf{direction}: set to \texttt{horizontal} to display foils horizontally
\end{itemize}