This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concepts in physiology, Subject name: Physiology
[{'content': 'Aggrecan is: \nSelect and explain. \nA. A receptor over platelets, B. A molecule present in osteoid tissue, C. Granules in leukocytes, D. Impoant component of cailage', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Aggrecan is a proteoglycan, also known as cailage-specific proteoglycan core protein (CSPCP) or chondroitin sulfate proteoglycan 1. It is encoded by the ACAN gene. Aggrecan is an integral pa of the extracellular matrix (ECM) in cailagenous tissue and it withstands compression in cailage.', 'role': 'assistant'}]