5002
Balkans envoy O'Brian stressed that the US would begin lifting sanctions against Yugoslavia and that only technical issues remain an obstacle to reestablishing relations .
 location: Balkans; person: O'Brian; geographical social political: US; geographical social political: Yugoslavia
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 location: Balkans; person: O'Brian; geographical social political: US; geographical social political: Yugoslavia