What is the definition and prevalence of the chronic obstructive pulmonary disease (COPD)?


a. COPD is the 4th cause of death in the world and the major cause of chronic morbidity. Its prevalence in Spain among people aged 40 to 80 is over 10%.
b. COPD is a rare disease that affects less than 1% of the population worldwide.
c. COPD is a disease that affects only smokers and its prevalence is decreasing worldwide.