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: Dental
IgA deposits on skin biopsy - 
Select and explain. 
A. Henoch schonlein purpura, B. Giant cell arteritis, C. Microscopic polyangitis, D. Wegener's granulomatosis
A: Henoch schonlein purpura
Answer: A: Henoch schonlein purpura 
Explanation: None