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': 'In mature erythrocytes, the pentose phosphate pathway is impoant as a source of: \nSelect and explain. \nA. Pentose phosphates, B. NADH to maintain heme iron in the ferrous form, C. For generation of energy in the form of ATP, D. NADPH to maintain glutathione in the reduced form', 'role': 'user'}, {'content': 'Answer: D \nExplanation: NADPH is used by glutathione reductase to maintain glutathione in the reduced form. Pentose phosphates are not needed in the red blood cell. The pentose phosphate pathway is not a source of NADH & ATP is not generated from NADPH.', 'role': 'assistant'}]