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': 'Drug induced lupus can be identified by: \nSelect and explain. \nA. Anti-histone antibodies, B. Double stranded DNA antibodies, C. Antinuclear antibodies, D. Anti-SM antibodies', 'role': 'user'}, {'content': "Answer: A \nExplanation: Anti-histone antibodies are positive in 50-100 % of the patients with drug induced lupus. The drugs most commonly associated with DIL are: ? Procainamide ? Hydralazine ? Quinidine ? Isoniazid So anti-histone antibodies are the single best answer of choice. Ref: Harrison's Principles of Internal Medicine, 16th Edition, Page 1961; Systemic Lupus Erythematosus By Robe G. Lahita, George Sokos, Jill P, Buyon, Takao Koike.", 'role': 'assistant'}]