Creating a Problem Sheet using datatool.sty
This example requires mth101.dbtex.
\documentclass{article}
\usepackage{etoolbox}
\usepackage{datatool}
\newbool{showanswers}
\booltrue{showanswers}
\DTLloaddbtex{\problemDB}{mth101.dbtex}
\begin{document}
\begin{center}\bfseries\Large
Assignment~1\ifbool{showanswers}{ (Solution Sheet)}{}
\end{center}
\begin{enumerate}
\DTLforeach*{\problemDB}
{\Label=Label,\Question=Question,\Answer=Answer}%
{%
\item \Question
\ifbool{showanswers}{\par\textbf{Solution: }\Answer}{}%
}
\end{enumerate}
\end{document}
Download datatoolprob.tex or datatoolprob.pdf.