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\n\n\nRBC\nHeart\nBrain\nLiver\nMuscle\nAdipose tissue\n\n\nGlucose\n\t\t\tFatty acids\n\t\t\tGlucose\n\t\t\tGlucose\n\t\t\tGlucose\n\t\t\tGlucose\nGlucose\xa0\n\t\t\tKetone bodies\n\t\t\tKetone bodies\n\t\t\tFatty acids / proteins\n\t\t\tFatty acids\n\t\t\tFatty acids', 'role': 'assistant'}]