Biochemistry Most common porphyria in humans is due to deficiency of which of the following enzyme: A PBG deaminase B Uroporphyrinogen decarboxylase C Ferrochelatase D Coproporphyrinogen oxidase 💡 Explanation Most common porphyria in humans is due to deficiency of which of the following enzyme: ✓ Correct Answer: B. Uroporphyrinogen decarboxylase