This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vasculitis, Subject name: Medicine
Which vasculitis is seen most commonly in childhood? 
Select and explain. 
A. Kawasaki, B. HSP, C. Susac syndrome, D. Giant cell
B: HSP
Answer: B: HSP 
Explanation: Disease in choice Age of presentation and findings Kawasaki Occurs predominantly in young children; 80% of patients are <5 yr, and, only occasionally, are teenagers or, more rarely, adults affected. HSP Usually seen in children; most patients range in age from 4 to 7 years; however, the disease may also be seen in infants and adults. Susac's Syndrome Consists of the triad of encephalopathy, branch retinal aery occlusions (BRAO), and hearing loss. It usually affects women aged 20 to 40, but men are also affected, and the age range extends from 9 to 72 years Giant Cell Aeritis Occurs almost exclusively in individuals >50 year