6778
Depending on factors such as the high cost of housing in city centres , lack of public transit , and traffic congestion , modes of travel may include automobiles , motorcycles , trains , aircraft , buses , and bicycles .
 disease: traffic congestion
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 disease: traffic congestion