This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
In an ECG the cardiac event corresponding to the ST segment is: 
Select and explain. 
A. Atrial depolarisation, B. Ventricular depolarisation, C. Atrial repolarisation, D. Ventricular repolarisation
D: Ventricular repolarisation
Answer: D: Ventricular repolarisation 
Explanation: PR - Interval corresponds with atrial depolarisation and conduction through AV node QRS - corresponds with Ventricular depolarisation + atrial repolarisation QT - corresponds with ventricular depolarisation + ventricular repolarisation Ref: Guyton 12th Ed