53816
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
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: OPEC 
Answer:
 organization: OPEC