This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, 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: QRS Complex in an electrocardigram indicates ventricular depolarisation source: Harrison 29th edition pg 1435', 'role': 'assistant'}]