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: Surgery
[{'content': 'Indications of ahoplasty : \nSelect and explain. \nA. Osteoahritis, B. Rheumatoid ahritis, C. Ankylosing spondylosis, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Osteoahritis; B i.e. Rheumatoid ahritis; C i.e. Ankylosing spondylosis', 'role': 'assistant'}]