Which statement about COPD etiologies is accurate based on the material?

• A. Genetic factors are the sole cause of COPD.
• B. Infections are not linked to COPD development.
• C. Autoimmune processes exclusively cause COPD.
• D. Environmental exposures such as smoking, biomass, pollution, and occupational factors are etiologies.

Answer: (D)

Chronic obstructive pulmonary disease mainly arises from long-term exposure to harmful particles and gases in the environment. The most important risk factor is cigarette smoking, but other environmental exposures play a major role too. Burning biomass fuels for cooking or heating, outdoor and indoor air pollution, and occupational inhalants like dusts, fumes, and chemicals all contribute to the airway inflammation and structural changes that characterize COPD. Genetic factors such as alpha-1 antitrypsin deficiency can increase susceptibility, and infections or autoimmune processes may influence disease in some individuals, but they are not the primary etiologies. Therefore, environmental exposures—including smoking, biomass smoke, pollution, and occupational factors—are the etiologies described.