This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
Which of the following is markedly decreased in restrictive lung disease - 
Select and explain. 
A. FVC, B. FEVl, C. FEV1/FVC, D. RV
A: FVC
Answer: A: FVC 
Explanation: Ans. is 'a' i.e., FVC Pulmonary function studies in Restrictiv e lung diseaseo Forced vital capacity (FVC)-Decreased (more than obstruction)o Forced expiratory volume in 1 second (FEV1)-Decreased in proportion to FVCo FEV1/FVC-Near normal or increasedo Forced mid expiratory flow rate-Reducedo Total lung capacity-Decreasedo Residual volume-Generally decreasedo Functional residual capacity7-Decreased