This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
FEV1 / FEVC ratio is decreased in all, except 
Select and explain. 
A. Bronchiectasis, B. Emphysema, C. Chronic bronchitis, D. Tuberculosis
D: Tuberculosis
Answer: D: Tuberculosis 
Explanation: ParameterObstructive lung diseaseRestrictive lung diseaseTotal lung capacityNormal to increaseDecreaseResidual volumeIncreaseDecreaseVital capacityDecreaseDecreaseFEV1/ FVC (FEV1%)DecreaseNormal to increaseFEF 25-75% (Forced expiratory flow rate)Decrease NormalDiffusion capacityNormal (| in emphysema)DecreasedRefer: Harrison's Principles of Internal Medicine, 18th edition, pg no: 2163-2165