system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Ferrochelatase is inhibited by -
assistant
The correct answer is  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).