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
[{'content': 'The frequency of renal involvement in HSP - \nSelect and explain. \nA. 20-40%, B. >80%, C. 40-60%, D. 10%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The reported incidence of renal involvement in HSP varies considerably between different studies.\nThis may be because of the different criteria used to describe the involvement & the variability of the length used to follow up.\nIn different studies, incidence of pediatric renal involvement in HSP was between 20-56% and in adults 50-78%', 'role': 'assistant'}]