This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
[{'content': 'Ferrochelatase is inhibited by - \nSelect and explain. \nA. Arsenic, B. Lead, C. Chromium, D. Mercury', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Lead * Lead inhibits ALA dehydratase. Therefore, lead poisoning causes inhibition of heme synthesis and excessive amount of d-ALA is excreted in urine. Lead can also inhibit ferrochelatase (heme synthase).", 'role': 'assistant'}]