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
QRS complex indicates - 
Select and explain. 
A. Atrial repolarization, B. Atrial depolarization, C. Ventricular repolarization, D. Ventricular depolarization
D: Ventricular depolarization
Answer: D: Ventricular depolarization 
Explanation: QRS Complex in an electrocardigram indicates ventricular depolarisation source: Harrison 29th edition pg 1435