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
A 5 year-old child presents with non-utatiening macules and pappules on the skin. Skin biopsy revealed a perivascular IgA deposition. Which of the following is the most likely diagnosis? 
Select and explain. 
A. Henoch Shonlein purpura, B. Wegener's granulomatosis, C. Kawasaki disease, D. Drug-induced vasculitis
A: Henoch Shonlein purpura
Answer: A: Henoch Shonlein purpura 
Explanation: Ans. a. Henoch-Shonlein purpura (Ref Harrison 19/e p2100, 18/e p2797)Presence of non-blanching palpable purpura (vasculitis of skin) and colicky abdominal pain (vasculitis of gastrointestinal tract) in a five-year-old child together with evidence of IgA deposition in immune complexes suggests the diagnosis of Henoch Scholein Purpura