This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: nutrition and digestion, Subject name: Biochemistry
[{'content': 'During starvation, which of the following shows the most marked increase in plasma concentration? \nSelect and explain. \nA. Free fatty acids, B. Glucose, C. Glycogen, D. Ketone bodies', 'role': 'user'}, {'content': "Answer: D \nExplanation: Under starvation conditions, ketone bodies are made in the liver and provide a major metabolic fuel source for skeletal and hea muscle and can serve to meet some of the brain's energy needs. Ref : Biochemistry by U. Satyanarayana 3rd edition Pgno : 295", 'role': 'assistant'}]