Final answer:
Statement (d) 'The basal lamina is primarily composed of elastin fibers' is not true because the basal lamina is composed mainly of glycoproteins and collagen, not elastin fibers.
Step-by-step explanation:
The student is asking which statement is NOT true about the basal lamina. The basal lamina is indeed a thin extracellular layer that lies underneath epithelial cells and separates them from other tissues. It does contain a specialized type of collagen and lines the inside of epithelial cells at the basal membrane surface. However, it is not primarily composed of elastin fibers. Thus, statement (d) 'The basal lamina is primarily composed of elastin fibers' is NOT true because the basal lamina's composition is mainly characterized by glycoproteins and collagen rather than elastin fibers, which are more associated with providing elasticity to tissues like the skin and blood vessel walls.