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': "Painless effusions in joints in congenital syphilis is called \nSelect and explain. \nA. Clutton' s joints, B. Banton's joints, C. Charcot's joints, D. Synovitis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]