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': 'Fatty acids are the main source of energy for \nSelect and explain. \nA. Muscles, B. Heart, C. Liver, D. RBC', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fed state Preferred fuel\nStarvation preferred fuel\n\n\n\n\nRBC\n\n\nGlucose\nGlucose\n\n\n\n\nHeart\n\n\nFatty acids\nKetone bodies\n\n\n\n\nBrain\n\n\nGlucose\nKetone bodies\n\n\n\n\nLiver\n\n\nGlucose\nFatty acids / protein\n\n\n\n\nMuscle\n\n\nGlucose\nFatty acids\n\n\n\n\nAdipose tissue\n\n\nGlucose\xa0\nFatty acids.', 'role': 'assistant'}]