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': 'Hyperkalemia shows the following changes in ECG, except \nSelect and explain. \nA. Increased T wave amplitude, B. Prolonged PR interval, C. ST depression, D. Prolonged QRS duration', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]