8161
The sudden doubling of crude oil prices by OPEC , the world 's leading oil exporting cartel , forced inflation to double-digit levels , averaging 11.3 % in 1979 and 13.5 % in 1980 .
 organization: OPEC
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:
 organization: OPEC