This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycobacterial Infections, Subject name: Dental
[{'content': "In severe cases Lucio's phenomenon is treated with: \nSelect and explain. \nA. Steroids, B. Exchange transfusion, C. Clofazimine, D. Lenalidomide", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lucio phenomenon - Type of lepra reaction seen in patients of Lucio leprosy where lesions are ulceronecrotic over lower extremities Do not respond to conventional treatment (Thalidomide) So in Severe cases exchange transfusion is done', 'role': 'assistant'}]