This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: HAEM synth and porphyrias, Subject name: Biochemistry
Which of the following is the prosthetic group of the enzyme ALA dehydratase? 
Select and explain. 
A. Zinc, B. Copper, C. Lead, D. Magnesium
A: Zinc
Answer: A: Zinc 
Explanation: ALA dehydratase is a zinc metalloprotein. Option c - Lead inhibits ALA dehydratase. -Additional information: List of zinc containing enzymes: Carbonic anhydrase Carboxy peptidase Alcohol dehydrogenase Alkaline phosphatase Lactate dehydrogenase ALA dehydratase Glutamate dehydrogenase Superoxide dismutase Phospholipase C RNA polymerase