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 normal. On exercise, her oxygen saturation drops from 92% to 86%.What is the likely diagnosis?
[A]. Alveolar hypoventilation
[B]. Primary pulmonary hypertension
[C]. Interstitial lung disease
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