text: Common risk<unk>  in the development of COPD are cigarette smoking, occupational pollutants, air pollution and genetics. Other risk<unk>  are increasing age, male gender, allergy and repeated airway infection.
option_0: Chronic obstructive pulmonary disease risk factors
option_1: Pulmonary embolism risk factors
option_2: Air embolism risk factors
option_3: Pulmonary edema risk factors
option_4: Pulmonary hypertension risk factors
option_5: Pneumonia risk factors
option_6: Bronchiolitis risk factors
option_7: Cardiomyopathy risk factors