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
Prevalence of post kala azar dermal leishmaniasis among patients with visceral leishmaniasis 
Select and explain. 
A. 10%, B. 100%, C. 50%, D. 20%
D: 20%
Answer: D: 20% 
Explanation: PKDL occurs usually in 20% of patients with visceral after successful treatment Ref: D.R. Arora.Medical parasitology 4th ed pg. 54