Final answer:
The lining of the trachea is an example of pseudostratified epithelium, characterized by a single layer of cells with nuclei arranged at different levels, giving the appearance of stratification.
Step-by-step explanation:
An example of pseudostratified epithelium is the lining of the trachea. Pseudostratified columnar epithelia line the respiratory tract and have a distinctive appearance because their cells are attached to the base membrane forming a single layer, but the arrangement of their nuclei at different levels gives the impression of multiple layers. Specifically, these epithelial cells have cilia on their apical surface and goblet cells interspersed to secrete mucus, which traps irritants and protects the respiratory system.
The example of pseudostratified epithelium among the given choices is the lining of the trachea (choice A).
Pseudostratified columnar epithelium is a type of epithelial tissue that appears to be stratified due to the arrangement of nuclei at different levels, but in reality, it is a simple tissue. It is commonly found in the respiratory tract. Goblet cells, which secrete mucus, are interspersed between the columnar epithelial cells in tissues such as the trachea, helping to trap irritants and protect the lungs.