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: Skin
[{'content': 'A patient presents with history of episodic painful edema of face and larynx and abdominal pain associated with stress. Which of the following is likely to be deficient \nSelect and explain. \nA. Complement C3, B. Complement C5, C. CI_ Esterase Inhibitor, D. Properidin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Cl esterase deficiency', 'role': 'assistant'}]