This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardio thoracic surgery  , Subject name: Surgery
[{'content': 'Patient can safely undergo major lung resection without increased risk of post operative complications if: \nSelect and explain. \nA. FEV1 > 1L, Normal DLCO, B. FEV1 > 1L, Decreased DLCO, C. FEV1 > 2L, Normal DLCO, D. FEV1>2L, Decreased DLCO', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pulmonary Function Test: Pulmonary function studies are routinely performed when any resection greater than a wedge resection will be performed. Of all the measurement available, the two most valuables are FEV1 and DLCO. For every 10% decline in patients DLCO, the risk of any pulmonary complication (as estimated by Odd ratio) increased by 42%. patients with FEV1>2.0L can tolerate pneumonectomy, and those with an FEV1 of >1.5 L can tolerate lobectomy. Ref: Bailey 27th edition Pgno: 916-917', 'role': 'assistant'}]