Which symptoms may be seen in a person affected by chronic obstructive pulmonary disease (COPD)?
1 persistent cough
2 less elastic alveoli
3 increased risk of lung infection
4 shortness of breath
1, 2, 3 and 4
2 )
1, 2 and 3 only
3 )
2, 3 and 4 only
4 )
1 and 4 only