Simple answer for multiple choice question

Question

I am writing a question, and I have something like this:

\begin{enumerate}
  \item Question 1 
    \begin{enumerate}
      \item Choice 1
      \item Choice 2
    \end{enumerate}
\end{enumerate}

and now I want to show the solution to this question. Is there a simple way of doing this? I just want a simple thing; using a package will be an overhead.

I tried adding \label{answer:q} after Choice 2, but when I use \ref{answer:q} it gives me 1b for the second choice, the 1 here is referring to the the parent \item, can I restrict this to the child \item to get only b?

Answer 1

You can redefine \p@enumii (the prefix used):

\documentclass{article}          

\makeatletter
\renewcommand\p@enumii{}
\makeatother

\newcommand\Ans[1]{\par The answer is~\ref{#1}.}

\begin{document}

\begin{enumerate}
  \item Question 1 
    \begin{enumerate}
      \item Choice 1
      \item Choice 2\label{test}
    \end{enumerate}
\end{enumerate}
\Ans{test}

\end{document}

Wuth the help of the enumitem package you can define a dedicated list for the choices, and you can easily customize the label and string used for cross-references:

\documentclass{article}          
\usepackage{enumitem}

\newlist{choices}{enumerate}{1}
\setlist[choices]{label=(\alph*),ref=(\alph*)}

\newcommand\Ans[1]{\par The answer is~\ref{#1}.}

\begin{document}

\begin{enumerate}
  \item Question 1 
    \begin{choices}
      \item Choice 1
      \item Choice 2\label{test}
    \end{choices}
\end{enumerate}
\Ans{test}

\end{document}