A patient presents with history of episodic painful edema of face and larynx. Which of the following is likely to be deficient –: (A) Complement C3, (B) Complement C5, (C) C1 Esterase Inhibitor, (D) Properidin
Answer is C. Recurrent episodes of edema of face and larynx suggest the diagnosis of hereditory angioneurotic edema caused by deficiency of C1 esterase inhibitor.