Pseudostratified tissue is classified as epithelial tissue (option A). This type of tissue appears to be stratified due to the varying heights of its cells and the positioning of the nuclei at different levels, but each cell actually rests on the basement membrane, making it a single layer.
Pseudostratified epithelium is commonly found in the respiratory tract, where it plays a key role in secretion and movement of mucus, thanks to the presence of cilia on its surface. Understanding this classification helps in studying the functions and characteristics of different tissues in the body.