Biochemistry In Krebs cycle, which of the following catalyses the step in which the first CO2 is released? A Aconitase B Isocitrate dehydrogenase C Succinate thiokinase D Succinate dehydrogenase 💡 Explanation In Krebs cycle, which of the following catalyses the step in which the first CO2 is released? ✓ Correct Answer: B. Isocitrate dehydrogenase