Of the following common causes of asthma, which is the least likely to cause exercise-induced asthma?

a. Long distance cycling
b. Running cross country
c. Skiing and snowboarding
d. Swimming indoors

ANS: C
Exercise-induced asthma (EIA) is common in asthmatics, especially after participation in outdoor activities in cold weather. The causes are not fully understood, but heat loss from the airways appears to be one of them.