31496
Its Presidency rotated between the member states every six months and it is related to the European Council , which was an informal gathering of national leaders ( started in 1961 ) on the same basis as the Council .
 organization: Presidency; organization: European Council; organization: Council
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: Presidency, European Council, Council 
Answer:
 organization: Presidency; organization: European Council; organization: Council