<prompt> C1 esterase inhibitor deficiency causes -Neisseria infectionHereditary angioneurotic edemaHemolytic diseaseHemolytic uremic syndrome  <response>: Ans. is b i.e., Hereditary angioneurotic edema o Hereditary angioneurotic edema is due to Ci inhibitor Cj esterase inhibitor deficiency.Complement Deficiencies and Associated DiseasesComponentAssociated DiseasesCLASSIC PATHWAYClq,Clr,ClS,C4C2Cl inhibitorImmune-complex syndromes, pyogenic infectionsImmune-complex syndromes, few with pyogenic infectionsRare immune-complex diseases, few with pyogenic infections,Hereditary angioneurotic edemaC3 AND ALTERNATIVE PATHWAYC3.C3DProperdinIHImmune-complex syndrome, pyogenic infections, Neisseria infectionsPyogenic infections. Neisseria infectionsNeisseria infectionsPyogenic infectionsHemolytic uremic syndromeMEMBRANE ATTACK COMPLEXC5, C6, C7, C8C9Recurrent Neisseria infections, immune-complex diseaseRare Neisseria infections 