A 64-year-old man with a 40-pack-year smoking history has chronic exertional dyspnoea and cough. Post-bronchodilator spirometry shows FEV₁/FVC ratio 0.60 and FEV₁ 55% predicted. Which statement best describes the diagnosis?ANormal spirometry; COPD is excludedBAsthma is confirmed by pre- and post-bronchodilator testingCCOPD is confirmed because post-bronchodilator FEV₁/FVC is <0.70DResults are indeterminate; peak flow monitoring is requiredESpirometry cannot be used to diagnose COPD in older adultsCheck my answer