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: Medicine
Which of the following diseases is/are mediated through complement activation - 
Select and explain. 
A. Atopic dermatitis, B. Graft versus Host disease, C. Necrotizing vasculitis, D. Urticaria
D: Urticaria
Answer: D: Urticaria 
Explanation: None