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
In obstructive lung all are true EXCEPT 
Select and explain. 
A. Residual volume normal, B. FEV decrease, C. FEV1/FVC decreases, D. Vital capacity normal
A: Residual volume normal
Answer: A: Residual volume normal 
Explanation: 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"