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: Orthopaedics
[{'content': "In osteoarthtitis, Bouchard nodes and Heberden's nodes seen respectively, \nSelect and explain. \nA. DIP and PIP, B. PIP and DIP, C. Palm and DIP, D. DIP and MCP", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]