In obstructive lung all are true EXCEPT: (A) Residual volume normal, (B) FEV decrease, (C) FEV1/FVC decreases, (D) Vital capacity normal
Answer is A. 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"