This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
[{'content': 'Which is not a product of the pentose phosphate pathway? \nSelect and explain. \nA. Sedoheptulose-7-phosphate, B. O2, C. Glyceraldehyde-3-phosphate, D. NADPH', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Step 5: Transketolase Reaction - Transketolase is a thiamine pyrophosphate (TPP) dependent enzyme. It transfers two-carbon unit (with keto group) from xylulose-5-phosphate to ribose-5-phosphate to form a 7 carbon sugar, sedoheptulose-7-phosphate and glyceraldehyde-3- phosphate. Transketolase enzyme will transfer the group from a donor ketose to an aldose acceptor. In thiamine deficiency transketolase activity is decreased. The reaction may be summarized as 5C + 5C = 7C + 3C. REF: DM VASUDEVAN TEXTBOOK OF BIOCHEMISTRY, SIXTH EDITION,PG.NO.,114.', 'role': 'assistant'}]