The correct answer is (c) Epidermis. The urinary bladder is composed of the following layers:
\begin{itemize}
\item Mucosa: Made up of transitional epithelium and lamina propria, allowing distension.
\item Submucosa: Provides structural support.
\item Muscularis: Composed of detrusor muscle, facilitating contraction and relaxation.
\item Serosa/Adventitia: Outermost layer providing protection.
\end{itemize}
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