<prompt> All are true about lignocaine exceptMost commonly used anesthetic agentEffective for 4560 minuteSafe for person prone to malignant hyperthermiaNone  <response>: Lignocaine can precipitate malignant hyperthermia, therfore it should not be used in patients with history of malignant hyperthermia.Lignocaine is the most commonly used anesthetic. Its duration of action is 45-60 min without adrenaline and 2-3 hours with adrenaline. 