Task: Class Definition Understanding (ontology: Earth_Environment/EnvironmentOntology)

Which of the following definitions best describes 'unilaminar epithelium'?

A. Unilaminar epithelium, which consists of a single layer of columnar cells. Examples: ciliated the concept, gastric epithelium, microvillus the concept.[FMA].
B. A closed epithelium with a lumen.
C. Epithelium which consists of a single layer of epithelial cells. Examples: endothelium, mesothelium, glandular squamous epithelium.[FMA].
D. Epithelial tubes transport gases, liquids and cells from one site to another and form the basic structure of many organs and tissues, with tube shape and organization varying from the single-celled excretory organ in Caenorhabditis elegans to the branching trees of the mammalian kidney and insect tracheal system.

Answer: Epithelium which consists of a single layer of epithelial cells. Examples: endothelium, mesothelium, glandular squamous epithelium.[FMA].