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': 'QRS complex indicates- \nSelect and explain. \nA. Atrial repolarization, B. Atrial depolarization, C. Ventricular repolarization, D. Ventricular depolarization', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Ventricular depolarisation) QRS complex is due to ventricular depolarization Q', 'role': 'assistant'}]