<prompt> A patient presents with history of episodic painful edema of face and larynx. Which of the following is likely to be deficientComplement C3Complement C5C1 Esterase InhibitorProperidin  <response>: Recurrent episodes of edema of face and larynx suggest the diagnosis of hereditory angioneurotic edema caused by deficiency of C1 esterase inhibitor. 