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In a typical ECG, the QRS complex represents:

AAtrial depolarisation (P wave is for this)
BVentricular repolarisation (T wave is for this)
CAtrial repolarisation (overshadowed by ventricular)
DVentricular depolarisation (contraction)
Answer & Solution
Correct answer: D. Ventricular depolarisation (contraction)
QRS complex = ventricular depolarisation = ventricular contraction (most prominent ECG feature). P = atrial depolarisation. T = ventricular repolarisation. Atrial repolarisation is hidden within the QRS.
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