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: Anaesthesia
[{'content': 'In which of the following procedures an armoured endotracheal tube is used? \nSelect and explain. \nA. Cardiovascular surgery, B. Neurosurgery, C. Thoracic surgery, D. Pediatric surgery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A special type of ET tube is used in head-neck surgery, neurosurgery or other surgeries where there is every possibilities of kinking of it. This type of ET tube is called the armoured tube. Here, the wall of the tube is reinforced with a spiral wire to reduce the chance kinking and collapse. This armoured ET tube is also useful when it is placed through a tracheostomy or laryngectomy stoma to provide an clear airway.', 'role': 'assistant'}]