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: Surgery
[{'content': "A man developed swelling of face frequently with occassional laryngeal edema, most probable diagnosis is aEUR' \nSelect and explain. \nA. C-1 esterase deficiency, B. Allergy, C. Anaphylaxsis, D. Not esterase deficiency", 'role': 'user'}, {'content': 'Answer: A \nExplanation: C1 esterase deficiency (Ref: Harrison 17"Ve p. 2066; Robbin\'s 7"\'/e p. 66, 671 Repeat from May 10 Q no.111', 'role': 'assistant'}]