This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Dehydrogenation of succinic acid to fumaric acid requires the following hydrogen carrier: 
Select and explain. 
A. NAD+, B. NADP+, C. flavoprotein, D. Glutathione
C: flavoprotein
Answer: C: flavoprotein 
Explanation: Succinate is dehydroge nated to fumarate, an unsaturated dicarboxylic acid, by succinate dehydrogenase. The hydrogen atoms are accepted by FAD. The FADH2 then enters into ETC to generate ATPs. The enzyme is a flavoprotein.
Reference: Vasudevan 7th  ed, pg 248