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.