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
A young patient sustains cardiac arrest, in the medical ward. Immediate defibrillation is advised when the ECG shows: 
Select and explain. 
A. Ventricular Tachycardia, B. Asystole, C. Electromechanical dissociation, D. Persistant Bradyarrhythmia
A: Ventricular Tachycardia
Answer: A: Ventricular Tachycardia 
Explanation: Answer is A (Ventricular Tachycardia) Defibrillation is indicated when cardiac arrest occurs secondary to ventricular fibrillation or pulseless ventricular tachycardia (shockable rhythms)