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': 'A cricoid hook is used paicularly - \nSelect and explain. \nA. In thyroidectomy, B. In block dissection of the neck, C. For retracting the superior laryngeal nerve, D. In tracheostomyMiscellaneous / 817', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., In tracheostomy", 'role': 'assistant'}]