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
All of the following drugs have been used in the treatment of Kala-azar, except - 
Select and explain. 
A. Sodium stibogluconate, B. Clindamycin, C. Amphotericin B, D. Pentamidine
B: Clindamycin
Answer: B: Clindamycin 
Explanation: None