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 patient presents with history of episodic painful edema of face and larynx. Which of the following is likely to be deficient – \nSelect and explain. \nA. Complement C3, B. Complement C5, C. C1 Esterase Inhibitor, D. Properidin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Recurrent episodes of edema of face and larynx suggest the diagnosis of hereditory angioneurotic edema caused by deficiency of C1 esterase inhibitor.', 'role': 'assistant'}]