Microbiology General 9ed3502c Hereditary angioneurotic edema is due to ? A Deficiency of C1 inhibitor B Deficiency of NADPH oxidase C Deficiency of MPO D Deficiency of properdin High-Yield Explanation Ans. is 'a' i.e., Deficiency of C1 inhibitor Hereditary angioneurotic edema is due to C1inhibitor (Ci esterase inhibitor) deficiency.