This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Which of the following is used with local anesthetics to potentiate their action? \nSelect and explain. \nA. Adrenaline, B. Sodium bicarbonate, C. Both 1 & 2, D. Dantrolene', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Adrenaline is a vasoconstrictor that prolongs duration of local anesthetics & prevents systemic toxicity.\nSodium bicarbonate speeds the action of local anesthetics by increasing the unionized form.', 'role': 'assistant'}]