Arsenic inhibits all except :
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.
PDH
Lipoic acid
a-KG dehydrogenase
Enolase