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: Pediatrics
In HSP gross hematurea is seen in what % of children? 
Select and explain. 
A. 5 - 10%, B. 10 - 20%, C. 20 - 30%, D. 30 - 40%
C: 20 - 30%
Answer: C: 20 - 30% 
Explanation: Ans. is 'c' i.e., 20 - 30% Henoch-schonlein_purpura (HSP) Small vessel vasculitis Purpuric rash Ahritis Abdominal pain Glomerulonephritis Gross hematuria is seen in 20-30% of cases