This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Most common cause of acute epiglottitis is \nSelect and explain. \nA. Hemophilus influenza type B, B. Pneumococcus, C. Streptococcus, D. Staphylococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is an acute inflammatory condition confined to supraglottic structures i.e, epiglottis, aryepiglottic folds and arytenoids. There is marked oedema of these structures which may obstruct the airway. Aetiology It is a serious condition and affects children of 2-7 years of age but can also affect adults. Haemophilus influenzae B is the most common organism responsible for this condition in children. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 327)', 'role': 'assistant'}]