This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'Enzyme involved in Variegate porphyria \nSelect and explain. \nA. Ferrochelatase, B. Protoporphyrinogen oxidase, C. Uroporphyrinogen decarboxylase, D. ALA dehydratase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Enzyme InvolvedType Major Signs and SymptomsResults of Laboratory TestsProtoporphyrinogen oxidaseVariegate porphyria (hepatic)Photosensitivity, abdominal pain,neuropsychiatric symptomsUrinary ALA, PBG, and coproporphyrinIII and fecal protoporphyrinIX increasedRef: Harper&;s Biochemistry; 30th edition; Chapter 31 Porphyrins & Bile Pigments', 'role': 'assistant'}]