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: Pathology
The frequency of renal involvement in HSP - 
Select and explain. 
A. 20-40%, B. >80%, C. 40-60%, D. 10%
C: 40-60%
Answer: C: 40-60% 
Explanation: The reported incidence of renal involvement in HSP varies considerably between different studies.
This may be because of the different criteria used to describe the involvement & the variability of the length used to follow up.
In different studies, incidence of pediatric renal involvement in HSP was between 20-56% and in adults 50-78%