Biochemistry Thiamine is a cofactor for all of the following enzymes except: A Alpha ketoglutarate dehydrogenase B Branched-chain keto-acid dehydrogenase C Succinate dehydrogenase D Pyruvate dehydrogenase. 💡 Explanation Thiamine is a cofactor for all of the following enzymes except: ✓ Correct Answer: C. Succinate dehydrogenase