125762
About 35 of these buses have been in service in a variety of different world cities in order to test the feasibility of hydrogen fuel cells in numerous countries or continents ( including UK , Australia and China ) , different operating circumstances and different conditions , especially weather conditions .
 UK, Australia, China
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 UK, Australia, China