This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'The following ECG changes do not include : \nSelect and explain. \nA. Prolonged PR interval, B. WidcrQRS, C. Inveed T waves, D. ST segment depression/ elevation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ref : guyton and hall / harrisons', 'role': 'assistant'}]