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: Skin
[{'content': 'Which of the following is not used in lepra reaction? \nSelect and explain. \nA. Chloroquin, B. Rifampicin, C. Clofazimine, D. Thalidomide', 'role': 'user'}, {'content': "Answer: B \nExplanation: Rifampicin REF: Rook's 7' ed p. 29.1-29.14 Treatment of lepra reactions according to severity Type 1 Type 2 Mild NSAIDS NSAIDS Moderate Nsaids , Coicosteroids NSAIDS , Clofazimine, Thalidomide, Chloroquine Severe NSAIDS . Coicosteroids Thalidomide , Coicosteroids , Parenteral antimony", 'role': 'assistant'}]