This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
[{'content': 'Prevalence of post kala azar dermal leishmaniasis among patients with visceral leishmaniasis \nSelect and explain. \nA. 10%, B. 100%, C. 50%, D. 20%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PKDL occurs usually in 20% of patients with visceral after successful treatment Ref: D.R. Arora.Medical parasitology 4th ed pg. 54', 'role': 'assistant'}]