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: Medicine
[{'content': 'About respiratory failure, the following is false: \nSelect and explain. \nA. Type III failure involves post-operative atelectasis, B. Type II failure doesn’t have fall in paO2 (hypoxia), C. Type I failure involves hypoxia (paO2), D. Pneumonia usually presents with type I respiratory failure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Type I or Hypoxemic respiratory failure is characterized by PaO2 <60 mm Hg with a normal or low arterial carbon dioxide tension.\xa0\n\nCauses:- Pneumonia, ARDS, pulmonary embolism, pulmonary edema\xa0\n\nType II or Hypercapnic respiratory failure is characterized by a PaCO2 >50 mm Hg. May be associated with hypoxemia.\xa0\n\nCauses:- Drug overdose, neuromuscular disease, chest wall abnormalities, and severe airway disorders (eg, asthma and COPD)\xa0\n\nType III failure involves post-operative atelectasis.\nType IV failure is due to decreased blood flow to respiratory muscles.', 'role': 'assistant'}]