<prompt> All the following are true about obstructive lung disease exceptDecreased FeV1Decreased MEFRIncreased RVIncreased diffusion capacity  <response>: Diffusion capacity is decreased in restrivtive lung disease.decreased in expiratory flow rate is a hallmark of obstructive lung disease. Residual volume is increased FEV1FVC is decresde Ref Harrison 19th edition pg 1661 