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': 'The following ECG findings are seen in Hypokalemia \nSelect and explain. \nA. Increased PR interval with ST depression, B. Increased PR interval with peaked T wave, C. Prolonged QT interval with T wave inversion, D. Decreased QT interval with ST depression', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Effects of hypokalaemia on the ECG Changes appear when K+ < 2.7 mmol/l Increased amplitude and width of the P wave Prolongation of the PR interval T wave flattening and inversion ST depression Prominent <a href=" waves</a> (best seen in the precordial leads) Apparent long QT interval due to fusion of the T and U waves Ref Harrison 20th edition pg 1456', 'role': 'assistant'}]