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': "The reducing equivalent for fatty acid synthesis is derived from \nSelect and explain. \nA. Glycolysis, B. Kreb's cycle, C. Urea cycle, D. pentose phosphate pathway", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]