This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'In stable angina \nSelect and explain. \nA. CK- MB is elevated, B. Troponin 1 is elevated, C. Myoglobin is elevated, D. The level of cardiac markers remain un changed', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref Harrison 19 th ed pg 1593 Necrotic myocardial fibres release a variety of enzymes into blood stream. In stable angina necrosis of the cell does not occur so there is no elevation of serum enzymes.', 'role': 'assistant'}]