This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Anatomy
[{'content': 'PR interval in ECG shows? \nSelect and explain. \nA. Ventricular depolarization, B. Ventricular Repolarization, C. Conduction through AV node., D. Atrial Repolarization', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Normal ECG waves and Intervals: ECG wave/Interval Characteristics 1. P Wave Reflects Atrial Depolarization (activation) 2. QRS complex Depolarization of ventricles 3. T Wave Repolarization of ventricles 4. PR Interval Atrial depolarization and conduction through AV node 5. QT Interval Total duration of Ventricular depolarization and repolarization 6. ST segment Plateau phase of ventricular action potential', 'role': 'assistant'}]