Putting solutions next to T/F choices

Question

Setup

I have the following MWE:

  \documentclass[addpoints,12pt]{exam}

  \usepackage{color}
  \usepackage{amsmath}
  \usepackage{amssymb}

  \checkboxchar{$\Box$}
  \checkedchar{$\blacksquare$}

  \bracketedpoints
  \shadedsolutions
  \renewcommand{\solutiontitle}{\noindent\textbf{Solution:}\par\noindent}


  \begin{document}

  \textbf{\textsc{True/False:}  [1pt each]}
  \vspace{0.1in}
   \begin{questions}

   \question Every normal distribution has a bell-shaped graph.

   \begin{oneparcheckboxes}
   \correctchoice T
   \choice F
   \end{oneparcheckboxes}

   \question If $X$ is a binomial random variable, then $X$ is approx. normal.

  \begin{oneparcheckboxes}
  \choice T
  \correctchoice F
  \end{oneparcheckboxes}

  \question Why did the chicken cross the road?
  \begin{solution}[1.0in]
  To get to the other side!
  \end{solution}

  \end{questions}
  \end{document}

Which produces a perfectly fine (short) exam. Now if I add the answers option - that is, change the first line to \documentclass[addpoints,12pt,answers]{exam} - then I will get the correct T/F choices bubbled in, and a solution for the short answer question.

Question

What I'd like to also do is add a short one-line solution next to each T/F question, with some reasoning. This solution would:

• have shaded background
• be on the same line as the T and F choices
• only be present when the answers option is given

Is there an easy way to do this?

Answer 1

I created \explanation, to be added at the end of the T/F oneparcheckboxes environment.

  \documentclass[addpoints,12pt,answers]{exam}

  \usepackage{color}
  \usepackage{amsmath}
  \usepackage{amssymb}

  \checkboxchar{$\Box$}
  \checkedchar{$\blacksquare$}

  \bracketedpoints
  \shadedsolutions
  \renewcommand{\solutiontitle}{\noindent\textbf{Solution:}\par\noindent}
  \definecolor{SolutionColor}{gray}{0.8}
  \def\explanation#1{%
    \ifprintanswers\mdseries\colorbox{SolutionColor}{\strut #1}\fi}

  \begin{document}

  \textbf{\textsc{True/False:}  [1pt each]}
  \vspace{0.1in}
   \begin{questions}

   \question Every normal distribution has a bell-shaped graph.

   \begin{oneparcheckboxes}
   \correctchoice T 
   \choice F
   \explanation{Explanation goes here}
   \end{oneparcheckboxes}

   \question If $X$ is a binomial random variable, then $X$ is approx. normal.

  \begin{oneparcheckboxes}
  \choice T
  \correctchoice F
   \explanation{Another explanation goes here}
  \end{oneparcheckboxes}

  \question Why did the chicken cross the road?
  \begin{solution}[1.0in]
  To get to the other side!
  \end{solution}

  \end{questions}
  \end{document}