Arsenic inhibits all except :: (A) PDH, (B) Lipoic acid, (C) a-KG dehydrogenase, (D) Enolase
Answer is D. D i.e. EnolaseArsenite (trivalent form of arsenic) forms a stable complex with thiol (-SH) group of lipoic acid, making it unavailable to serve as a coenzyme. So arsenic poisoning is primarily d/t inhibition of enzymes that require lipoic acid (lipoate) as a coenzyme including E2 of PDH complex, a-Ketoglutarate dehydrogenase and branched chain a-ketoacid dehydrogenaseQ.