A nurse is caring for a client who received succinylcholine IV bolus during an abdominal surgery. The client develops malignant hyperthermia. The nurse should administer which of the following medications?

A. Dantrolene is the antidote for malignant hyperthermia, a life-threatening complication of certain anesthetics and muscle relaxants like succinylcholine. B. Naloxone reverses opioid overdose. C. Acetylcysteine treats acetaminophen overdose. D. Baclofen is a muscle relaxant but is not effective for malignant hyperthermia.