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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
In COPD which is true
assistant
The correct answer is  COPD is characterised by reduced FEV1 with a reduction in FEV1/FVC ratio less than 0.7.With worsening disease severity,lung volumes may increase,resulting in an increase in TLC,RV and FRC. Reference:Harrison's medicine-18th edition,page no:2156.