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
[{'content': 'Which of the following diseases is/are mediated through complement activation - \nSelect and explain. \nA. Atopic dermatitis, B. Graft versus Host disease, C. Necrotizing vasculitis, D. Urticaria', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]