This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
A girl licks paint that is peeled of from the toys, develop acute abdominal pain, tingling sensation of hands and legs and weakness. Which enzyme is inhibited in this child? 
Select and explain. 
A. ALA synthase, B. Heme oxygenase, C. Coproporphyrinogen oxidase, D. ALA dehydratase
D: ALA dehydratase
Answer: D: ALA dehydratase 
Explanation: Ans. D. ALA dehydratasePaints contain lead hence it is most probably lead poisoning. Biochemical effects of lead poisoning are:Inhibition of ALA dehydratase >> Ferro chelataseIncreased ALA excretion in urine. Increased ALA synthase activity.