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: Microbiology
[{'content': 'C1 esterase inhibitor deficiency causes ? \nSelect and explain. \nA. Neisseria infection, B. Hereditary angioneurotic edema, C. Hemolytic disease, D. Hemolytic uremic syndrome', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Hereditary angioneurotic edema Hereditary angioneurotic edema is due to C1 inhibitor (CI esterase inhibitor) deficiency.", 'role': 'assistant'}]