A patient with sideroblastic anemia is likely to have a defect in which of the following enzymes?

A Delta-aminolevulinic acid synthase
B Ferrochelatase
C Porphobilinogen deaminase
D Uroporphyrinogen decarboxylase
Sideroblastic anemia is characterized by a defect in delta-aminolevulinic acid synthase, leading to impaired heme synthesis and accumulation of iron in mitochondria.
Wintrobe's Clinical Hematology
Hematology Hematology: Anemia Hematology: Anemia Hard MEDICAL Confidence: high