<prompt> Acute intermittent porphyria is caused by deficiency of enzyme?Uroporphyrinogen I synthaseFerrochelataseUroporphyrinogen III synthaseProto-oxidase  <response>: Ans. A. Uroporphyrinogen I synthase. Ref. Harpers Biochemistry 26th ed. 270-278.Porphobilinogen deaminase also known as hydroxymethylbilane synthase or uroporphyrinogen I synthase causes AIP...So, HMB1 synthase UP I synthase!!!TypeporphyriaDeficient enzymeInheritancePhotosensitivityNeurovisceral SymptomsHEPATIC PORPHYRIAS ALA-dehydratase deficiency ADPALA-dehydrataseAR-Acute intermittent porphyria AIPHMB-synthaseAD-Porphyria cutanea tarda PCTURO-decarboxylaseAD-Hereditary coproporphyria HCPCOPRO-oxidaseADVariegate porphyria VPPROTO-oxidaseADERYTHROPOIETIC PORPHYRIAS X-linked sideroblastic anemia XLSAALA-synthaseXLR--Congenital erythropoietic porphyria CEPURO-synthaseAR-Erythropoietic protoporphyria EPPFerrochelataseAD- 