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
This drug can clear trypanosomes from blood and lymph nodes and is active in late CNS stages of African sleeping sickness. It is : 
Select and explain. 
A. Emetine, B. Melarsoprol, C. Nifurtimox, D. Suramin
B: Melarsoprol
Answer: B: Melarsoprol 
Explanation: None