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A 3-year- old boy is brought to the emergency room with abdominal pain, mental status changes and fatigue. On taking history the physician finds that the child belongs to a very poor family, lives in an old house and has the habit of licking the paint chips that have crumbled in the window sills. The physician suspects lead poisoning. Lead typically interferes with which of the following enzymes ?

A) Cytochrome oxidase

B) Protoporphyrinogen oxidase

C) ALA synthase

D) Porphobilinogen synthase

E) ALA dehydratase

lead paint

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