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': 'To give field block the LA should be deposited near \nSelect and explain. \nA. Main trunk, B. Large branch of peripheral nerve, C. Small nerve endings, D. Periodontal ligament', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]