This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inhalational Anesthetic Agents, Subject name: Anaesthesia
[{'content': '25 yr old female develops masseter muscle spasm after IV succinyl choline. ETCO2 progressively increases, hea rate increases, temperature raises; management includes all except :- \nSelect and explain. \nA. Sta halothane to decrease the hea rate, B. Hyperventilate with 100 % oxygen, C. Active cooling measures, D. Treat acidosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is most probably malignant hypehermia. Halothane is contraindicated in malignant hypehermia.', 'role': 'assistant'}]