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In the 21st century , the European Union , the United States , Canada , Mexico , Japan , and many other countries require producers to obtain special certification to market their food as " organic " .
 21st century, European Union, United States, Canada, Mexico, Japan
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:
 21st century, European Union, United States, Canada, Mexico, Japan