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General Medicine General c48e7250

A 29 year old anxious lady presents with a history of progressive breathlessness and exercise intolerance since four months. Her FVC is 90% and FEV I / FVC is 86%. Oxygen saturation after exercise was observed to drop from 92% to 86%. What is the likely diagnosis :

A
Primary alveolar hypoventilation
B
Primary pulmonary hypeension
C
Anxiety disorder
D
Interstitial lung disease

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