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 retractor is used for retracting the lingual flap because of close proximity of lingual nerve to mandibular 3rd molar: \nSelect and explain. \nA. Howarth retractor., B. Austin retractor., C. L retractor., D. Any of the above.', 'role': 'user'}, {'content': "Answer: A \nExplanation: Howarth's retractor:\xa0 Howarth's elevator can be used for retracting the lingual flap because of close proximity of the lingual nerve in relation to the impacted third molar.", 'role': 'assistant'}]