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: Surgery
[{'content': 'Which of the following statements regarding the action of local anesthetics is true? \nSelect and explain. \nA. More the pH in an area Less effective is the action of anesthetic agent, B. Less the pH of in an area, less effective is the action of an anesthetic agent, C. There is little relation between H ion concentration and anesthetic activity, D. There is no correlation between H ion concentration and anesthetic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]