This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Microscopic examination of aicular surface of a synol joint demonstrates the following histology representing: \nSelect and explain. \nA. Hyaline cailage, B. Adipocytes, C. Endothelial cells, D. Periosteum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The typical diahrodial synol joint has two opposing surfaces composed of hyaline aicular cailage. Microscopically, the cailage is composed of four distinct zones. 1) Superficial tangential zone characterized by chondrocytes, and collagen fibers aligned roughly parallel to the surface 2) Intermediate zone 3) Deep radial zone with chondrocytes and collagen fibers aligned perpendicular to the surface 4) Zone of calcified cailage firmly joined to the underlying subchondral bone', 'role': 'assistant'}]