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': 'The receptors for parathyroid hormone are present in: \nSelect and explain. \nA. Osteoblasts, B. Osteoclasts, C. Periosteum, D. Cartilage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]