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: Surgery
[{'content': 'In obstructive lung all are true EXCEPT \nSelect and explain. \nA. Residual volume normal, B. FEV decrease, C. FEV1/FVC decreases, D. Vital capacity normal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Residual volume normal REF: Harrison\'s Internal Medicine 17th ed> Chapter 246. Disturbances of Respiratory Function See APPENDIX-53 for "OBSTRUCTIVE VS RESTRICTIVE LUNG DISEASE"', 'role': 'assistant'}]