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: Surgery
[{'content': 'Which of the following enzymes can be found in CSF: \nSelect and explain. \nA. LDH & CK., B. ALT & CK, C. ALT & LDH., D. All of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]