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: Physiology
[{'content': 'Aggrecan in: \nSelect and explain. \nA. 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: D i.e. Impoant component of cailage', 'role': 'assistant'}]