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': 'Reducing agent used in lipogenesis is derived from \nSelect and explain. \nA. Pentose phosphate pathway, B. Glycolysis, C. TCA cycle, D. Gluconeogenesis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: NADPH is involved as donor of reducing equivalents in both the reduction of the 3-ketoacyl and of the 2, 3-unsaturated acyl derivatives. The oxidative reactions of the pentose phosphate are the chief source of the hydrogen required for the reductive synthesis of fatty acids.', 'role': 'assistant'}]