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': 'In an ECG the cardiac event corresponding to the ST segment is: \nSelect and explain. \nA. Atrial depolarisation, B. Ventricular depolarisation, C. Atrial repolarisation, D. Ventricular repolarisation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PR - Interval corresponds with atrial depolarisation and conduction through AV node QRS - corresponds with Ventricular depolarisation + atrial repolarisation QT - corresponds with ventricular depolarisation + ventricular repolarisation Ref: Guyton 12th Ed', 'role': 'assistant'}]