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
Heberden's nodes are found in: 
Select and explain. 
A. PIP joints in osteoahritis, B. DIP joints in osteoahritis, C. PIP joints in rheumatoid ahritis, D. DIP joints in osteoahritis
B: DIP joints in osteoahritis
Answer: B: DIP joints in osteoahritis 
Explanation: Ans. DIP joints in osteoahritis