General Medicine General fc2b6a2d A 29 yr old unmarried female presents with dyspnea her chest X-ray is normal, FVC is 92%, FEVI/FVC is 89% and DLCO is 59% of nonnal. On exercise her oxygen saturation drops from 92% to 86%. What is the likely diagnosis aEUR' A Alveolar hypoventilation B Primary pulmonary hypeension C Interstitial lung disease D Anxiety