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In 2008 , the American Conference of Governmental Industrial Hygienists reduced the short-term exposure limit to 0.25 parts per million ( ppm ) .
 organization: American Conference of Governmental Industrial Hygienists
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: American Conference of Governmental Industrial Hygienists 
Answer:
 organization: American Conference of Governmental Industrial Hygienists