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': 'Pair of organs involved in cahill cycle? \nSelect and explain. \nA. Liver and muscle, B. liver and kidney, C. liver and brain, D. muscle and kidney', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]