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
[{'content': 'Step in HMP pathway requiring TPP \nSelect and explain. \nA. G6PD, B. 6 Phosphogluconate dehydrogenase, C. Transketolase, D. Transaldolase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Transketolase requires thiamine pyrophosphate (TPP).', 'role': 'assistant'}]