Which of the following organ in human, lined by epithelium with nuclei at different levels

A special type of single columnar epithelium is the so-called pseudostratified. Its name is derived from its appearance. It seems it is a stratified type of epithelium but in truth is it is comprised of only one layer of cells. However, the cells and their nuclei are positioned in a way that there seems to be more than one layer.

Ciliated pseudostratified columnar epithelia is the type of respiratory epithelium found in the linings of the trachea as well as other respiratory tract, which allows filtering and humidification of incoming air.