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': 'Loading dose of leflunomide in rheumatoid arthritis is : \nSelect and explain. \nA. 20 mg, B. 10 mg, C. 100 mg, D. 400 mg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]