This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pre Anesthetic Evaluation, Subject name: Anaesthesia
[{'content': 'Lithium therapy must be stopped how many hours before surgery:- \nSelect and explain. \nA. 24 hrs, B. 48 hrs, C. 72 hrs, D. 96 hrs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lithium therapy is stopped 24-48 hr prior to surgery since it may potentiate neuromuscular blockers', 'role': 'assistant'}]