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': 'A 65 years old lady presented with a swollen and painful knee. On examination, she was found to have grade III osteoarthritic changes. What is the best course of action? \nSelect and explain. \nA. Conservative management, B. Arthroscopic washing, C. Partial knee replacement, D. Total knee replacement', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Grade I to III →\xa0Start with conservative treatment. If fails, surgery is indicated.\nGrade IV & V → Total knee replacement is the treatment of choice.', 'role': 'assistant'}]