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': "Widening of intercondylar notch of femur is seen in \nSelect and explain. \nA. Osteoarthritis, B. Rheumatoid arthritis, C. Hemophiliac Artheopathy, D. Charcot's joint", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]