This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Parasitic Drugs, Subject name: Pharmacology
[{'content': 'This drug can clear trypanosomes from blood and lymph nodes and is active in late CNS stages of African sleeping sickness. It is: \nSelect and explain. \nA. Emetine, B. Melarsoprol, C. Nifuimox, D. Suramin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Treatment of trypanosomiasis is: African sleeping sickness * Early Haemolymphatic stage : Suramin * Late CNS Stages : Melarsoprol South American disease (Chagas disease) : Benznidazole', 'role': 'assistant'}]