How to use char č in \choicemenu

Question

I'm starting with LaTex and I'm doing on fillable form. One of options in form is dropdown list (\choicemenu). One of choices is "Oče", but when I compile file into PDF the letter č becomes c (Oče becomes Oce).

Here is the part of the code:

\ChoiceMenu[width=5em, print,combo,default=Izberite...,name=odd, ]{Vlagatelj je:}    {Mati, Oče, Druga oseba} \\

I want to use this type of choice, because it works on all devices (including Android). I use utf8 encoding.

Thanks for help.

This is larger part of code:

\usepackage[english, slovene]{babel} % 'french', 'german', 'spanish', 'danish', etc.
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{txfonts}
\usepackage{mathdots}
\usepackage[classicReIm]{kpfonts}
\usepackage{graphicx}
\usepackage[a4paper,includeheadfoot,margin=1 cm]{geometry}
\usepackage{array}
\usepackage[document]{ragged2e}
\usepackage{hyperref}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{geometry}
\usepackage[table]{xcolor}
\usepackage{lmodern}

% You can include more LaTeX packages here 
\newcommand\tab[1][0.2cm]{\hspace*{#1}}
\newcommand\ltab[1][0.5cm]{\hspace*{#1}}

\geometry{
 headheight=0pt,headsep=0pt, foot=0pt,
 }

\begin{document}
\selectlanguage{slovene}
%\selectlanguage{english} % remove comment delimiter ('%') and select language if required

\begin{Form}
\begin{tabular}{|m{5cm}|m{13cm}|}
  \hline    
  & \normalsize Sime text \\  
  & \\
  \large \textbf{Some text} & \large Some text \\
  \large {\textbf{Some text}} & \large Some text\\
  & \large Some text\\
  & \large Some text\\
\hline

 \large {\begin{flushright}Some text\end{flushright}} & \ChoiceMenu[width=5em, combo,default=Izberite...,name=odd, ]{Vlagatelj je:}    {Mati, O\v{c}e, Druga oseba} \\
\end{tabular}
\end{Form}
\end{document}