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: Pharmacology
[{'content': 'Chloroquine is useful in: \nSelect and explain. \nA. Discoid lupus erythematosis, B. Rheumatoid arthritis, C. Infectious mononucleosis, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hydroxychloroquine\u200b\nHydroxychloroquine is\xa0used\xa0for\xa0early, mild RA, often combined with methotrexate. This agent is also used in the treatment of lupus and malaria. Its mechanism of action in auto-immune disorders is unknown, and onset of effects takes 6 weeks to\xa0 6\xa0 months.\nMonotherapy may be initiated with any of the DMARDs (methotrexate, leflunomide, hydroxychloroquine\xa0or\xa0sulfasalazine)\xa0for\xa0patients\xa0with low\xa0disease\xa0activity.\u200b\n\u200bDMARDs = Disease modifying Anti-Rheumatic Drugs.\nReference: Lippincott Illustrated Reviews: Pharmacology Wolters Kluwer Sixth Edition page no 457,458\u200b', 'role': 'assistant'}]