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: Medicine
[{'content': 'True about subcutaneous nodule in Rheumatic fevera) Non tenderb) Most common manifestationc) Present in extensor surfacesd) Associated with arthritis \nSelect and explain. \nA. ac, B. bc, C. ad, D. b', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]