\documentclass[border=2pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{mindmap}
\begin{document}
\begin{tikzpicture}[mindmap, grow cyclic, every node/.style=concept, concept color=blue!40]
  \node {Root}
    child { node {A} }
    child { node {B} }
    child { node {C} };
\end{tikzpicture}
\end{document}
