아래의 환경에서 한글을 사용하기 위해서 추가되어야 페키지가 뭐인지요?

\documentclass{amsbook}

\usepackage{enumitem} % for custom lists

\usepackage{answers} % for separating solutions %

\usepackage[nosolutionfiles]{answers}

\newlist{questions}{enumerate}{5} \setlist[questions]{label*=Question \arabic*.} \newcommand{\question}{\item} % open the answer file \Opensolutionfile{answers}

\Newassociation{answer}{ansWER}{answers}

\begin{document}

\begin{questions} \question $1+1=?$

\begin{answer} $1+1=2$

\end{answer}

\question What is $1+2=?$

\begin{answer}

$1+2=3$

\end{answer}

\end{questions} % close the answer file

\Closesolutionfile{answers} % use this line if you'd like to include the answers separately

\clearpage

\IfFileExists{answers.tex}{\input{answers.tex}}{no file!}

\end{document}

저는 현재 \documentclass[dvipdfmx,finemath,nobookmarks,kosection,chapter,twoside,openright,11pt]{oblivoir}을 이용하는데 바꾸어 볼려구요

감사합니다