Which reaction(s) within the Krebs cycle results in the formation of reduced nicotinamide adenine dinucleotide (NADH)?

• A. Conversion of isocitrate to α-ketoglutarate, conversion of α-ketoglutarate to succinyl-CoA, and conversion of malate to oxaloacetate.
• B. Conversion of succinate to fumarate
• C. Conversion of citrate to isocitrate, and conversion of succinate to fumarate
• D. Conversion of citrate to isocitrate, conversion of isocitrate to α-ketoglutarate, and conversion of α-ketoglutarate to succinyl-CoA

Answer: (A)