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: Radiology
[{'content': "Heberden's nodes are found in: \nSelect and explain. \nA. PIP joints in osteoahritis, B. DIP joints in osteoahritis, C. PIP joints in rheumatoid ahritis, D. DIP joints in osteoahritis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. DIP joints in osteoahritis', 'role': 'assistant'}]