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': 'The closed mouth technique for mandibular nerve block is \nSelect and explain. \nA. Clark and Holmes technique, B. Akinosi-Vazarani technique, C. Gow gates technique, D. Angelio sergenti technique', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]