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: Medicine
[{'content': 'Not an ECG finding of hypokalemia: September 2009 \nSelect and explain. \nA. Absent T waves, B. ST elevation, C. Flat T waves, D. Prominent U wave', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: ST elevation', 'role': 'assistant'}]