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: Unknown
[{'content': 'End tracheostomy is done in patients undergoing surgery for: \nSelect and explain. \nA. Laryngectomy, B. Laryngofissure surgery, C. Oropharyngeal tumor, D. Obstructive sleep apnea with stridor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Refer: PL Dhingra, Textbook of Ear, Nose, Throat, 6th edition, pg no: 316)\nTypes of tracheostomy\n\nEmergency tracheostomy\nElective tracheostomy\nPermanent tracheostomy\nPercutaneous dilatational tracheostomy\nMini tracheostomy\n\nIndications of tracheostomy', 'role': 'assistant'}]