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': 'All the following are the electrocardiographic features of hyperkalemia except \nSelect and explain. \nA. Prolonged PR interval, B. Prolonged QT interval, C. Sine wave pattern, D. Loss of P waves', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hyperkalemia pro- duces a sequence of changes (), usually beginning with nar- rowing and peaking (tenting) of the T waves. Fuher elevation of extra- cellular K+ leads to AV conduction disturbances, diminution in P-wave Ref Harrison 20th edition pg 1421 amplitude, and widening of the QRS interval.', 'role': 'assistant'}]