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: ENT
[{'content': 'Early complications of tracheostomy are -a) Haemorrhageb) Displacement of tube or obstructionc) Surgical emphysemad) Tracheal stenosis \nSelect and explain. \nA. ab, B. bc, C. abc, D. bcd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]