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': 'Antibody found in myositis is ? \nSelect and explain. \nA. Anti Jo 1, B. Anti scl 70, C. Anti Sm, D. Anti Ku', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]