This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'All of the following are the electrocardiographic features of Hyperkalemia, except- \nSelect and explain. \nA. Prolonged PR interval, B. Prolonged QT interval, C. Sine wave patterns, D. Loss of P waves', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Early ECG changes of hyperkalemia, typically seen at a serum potassium level of 5.5-6.5 mEq/L, include the following: Tall, peaked T waves with a narrow base, best seen in precordial leads. Shoened QT interval. ST-segment depression . Ref Harrison 20th edition pg 1411', 'role': 'assistant'}]