<prompt> Most common porphyria in humans is due to deficiency of which of the following enzyme:PBG deaminaseUroporphyrinogen decarboxylaseFerrochelataseCoproporphyrinogen oxidase  <response>: Porphyria Cutanea Tarda is the most common porphyria. Enzyme defect:- Uroporphyrinogen decarboxylase Sporadic type 1 Familial type 2 Can also develop after exposure to halogenated aromatic hydrocarbons. MC Acute porphyria - Acute intermittent porphyria MC porphyria in children - Erythropoietic protoporphyria 