system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Increased Alveolar arterial difference in PaO2 is seen in all except?
assistant
The correct answer is  GBS is extra-parenchymal restrictive lung disease, so P(A - a)O2 is normal.