单选题:70岁男性,肥胖,暴食后胸痛,疑心肌梗死,测血乳酸脱氢酶同工酶。已知乳酸脱氢酶是由两种亚基组成的四聚体,存在的同工酶种类

题目内容:
70岁男性,肥胖,暴食后胸痛,疑心肌梗死,测血乳酸脱氢酶同工酶。已知乳酸脱氢酶是由两种亚基组成的四聚体,存在的同工酶种类有(  )。 A.4种
B.2种
C.3种
D.5种
E.6种
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