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': "What is Kienboch's disease - \nSelect and explain. \nA. Osteochondritis of lunate, B. Osteochondritis of neck of femur, C. Osteochondritis of navicular, D. Osteochondritis of tibial condyle", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]