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': 'The narrowest part of larynx in infants is at the cricoid level. In administering anaesthesia this may lead to all except – \nSelect and explain. \nA. Choosing a smaller size endotracheal tube, B. Trauma to the subglottic region, C. Post operative stridor, D. Laryngeal oedema', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Subglottic region (cricoid region) is the narrowest part of larynx in infants. Mucosal trauma to force a tube can cause post-operative edema, stridor, croup and airway obstruction.\nThe size of tube is very important, both oversize and undersize tube are dangerous :-\n\n\nOversize tube will increase the chance of trauma and post intubation edema, croup & stridor.\nUndersize tube will increase the chance of aspiration (because uncuffed tubes are used in children and the best way to prevent aspiration is to use appropriate size tube).', 'role': 'assistant'}]