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': 'Which of the following is primary ketone body? \nSelect and explain. \nA. Acetone, B. Acetoacetate, C. Beta hydroxybutyrate, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acetoacetate is the primary ketone body, secondary ketone bodies are acetone and beta hydroxybutyrate.', 'role': 'assistant'}]