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
[{'content': 'A person presented with recurrent swelling on face and lips due to emotional stress, cause is – \nSelect and explain. \nA. C1 esterase inhibitor deficiency, B. Allergy, C. Anaphylaxis, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Recurrent episodes of edema of face & lips after emotional stress suggest the diagnosis of Hereditary Angioneurotic Edema caused by C1 esterase inhibitor deficiency.', 'role': 'assistant'}]