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': 'Sources of NADPH are : \nSelect and explain. \nA. Malic enzyme, B. Cytoplasmic isocitrate dehydrogenase, C. Pentose phosphate pathway, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: These are the only 3 sources of NADPH that are currently known.', 'role': 'assistant'}]