5-Aminolevulinic acid

Hepatitis C can be associated with it, as well as alcoholism.

And we just want to know about the deficient enzyme, choice A. Delta-ALA dehydratase? Wrong fucking answer, so here's the deal.

Both delta-ALA dehydratase as well as ferrochelatase, I want you to simply memorize that these two enzymes are inhibited by lead poisoning.

Okay, now...

They'll list choice A as the correct answer for what's deficient slash inhibited, and ferrochelates won't be listed, but you gotta know both A and C for lead poisoning.

Regardless, wrong fucking answer.

Choice B, Delta-ALA synthase, wrong fucking answer.

So sideroblastic anemia is the first step in heme synthesis.