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': 'All of the following drugs have been used in the treatment of Kala-azar, except - \nSelect and explain. \nA. Sodium stibogluconate, B. Clindamycin, C. Amphotericin B, D. Pentamidine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]