This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
Mesangial deposits of IgA in renal glomeruli is a feature of - 
Select and explain. 
A. Henoch Schonlin purpura, B. Membranoproliferative glomerulonephritis, C. Lipoid nephrosis, D. Alpo syndrome
A: Henoch Schonlin purpura
Answer: A: Henoch Schonlin purpura 
Explanation: Henoch-Schlein purpura come under type1 RPGN and they are associated with crescent formation. Henoch-Schonlein or anaphylactoid purpura is a self-limited type of hypersensitivity vasculitis occurring in children and young adults. Circulating immune complexes are deposited in the vessel wall consisting of IgA, C3, and fibrin, and in some cases, properdin suggesting activation of alternative complement pathway as the trigger event. Henoch-Schonlein purpura is characterized by hypersensitivity vasculitis and palpable purpura. Ref: Textbook of pathology Harsh Mohan 6th edition page 331