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【单选题】
琥珀酸脱氢酶通常催化琥珀酸的脱氢反应。丙二酸在与此酶形成暂时性复合物方面和琥珀酸非常相似，但丙二酸本身不能由琥珀酸脱氢酶催化脱氢。在这一例子中，琥珀酸和丙二酸分别是：（）A.
前者为底物，后者为竞争性抑制剂
B.
前者为竞争性抑制剂、后者为底物
C.
前者为正调节剂（效应物），后者为负调节剂
D.
前者为负调节剂，后者为正调节剂（效应物）。
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