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: Pathology
[{'content': 'Which is the best marker of SLE ? \nSelect and explain. \nA. Anti Sm antibodies, B. Anti dsDNA antibodies, C. Anti histone antibodies, D. Anti Ro Antibodies', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Anti dsDNA antibodies Antibodies to double - stranded DNA and the Smith (Sm) antigen are viually diagnostic of SLE".', 'role': 'assistant'}]