2800
He participated to Hague Peace Conference , marked the necessity of reforms in Armenians-inhabited territories of Ottoman Empire .
 location: Ottoman Empire
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: Ottoman Empire 
Answer:
 location: Ottoman Empire