Task: Question Answering
Input (English): Question: Defibrillation is characterized by: 
 Options:  <1> It requires the patient's previous sedation. <2> It is usually used when the patient is in asystole. <3> It can be applied in ventricular tachycardias with a pulse. <4> The discharge is not synchronized with the patient's heart rate. <5> A minimum intensity discharge should be used.
Output (English): 4