題目檸檬酸循環代謝反應中那一步驟形成FADH2\mathrm{FADH}_{2}FADH2?A.α-酮基戊二酸(α-ketoglutarate)形成琥珀醯-輔酶A(succinyl CoA)B.琥珀醯-輔酶A(succinyl CoA)形成琥珀酸(succinate)C.琥珀酸(succinate)形成延胡索酸(fumarate)D.蘋果酸(malate)形成草醯醋酸(oxaloacetate)官方答案C