This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pre Anesthetic Evaluation, Subject name: Anaesthesia
[{'content': 'All are risk factor for postoperative pulmonary complications except ? \nSelect and explain. \nA. ASA class 3 and 4 patients, B. Longer surgeries >2 hr, C. Upper Abdominal surgery, D. Age > 60 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Risk factor for postoperative pulmonary complications: Patients >=60 years of age COPD Markedly reduced exercise tolerance and functional dependence Hea failure ASA class 3 and 4 Cigarette smoking Longer surgeries (>4 h), Ceain types of surgery Abdominal Thoracic Aoic aneurysm Head and neck Emergency surgery GA (compared with cases in which GA was not used).', 'role': 'assistant'}]