This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
Total number of dehydrogenases Krebs cycle 
Select and explain. 
A. 3, B. 2, C. 4, D. 5
C: 4
Answer: C: 4 
Explanation: Isocitrate dehydrogenase (ICD) enzyme succinate dehydrogenase Malate dehydrogenase a-ketoglutarate dehydrogenaseRef: MN Chatterjea Textbook of Medical Biochemistry, 8th edition, page no: 339