84196
Serbia was conquered in a little more than a month , as the Central Powers , now including Bulgaria , sent in 600,000 troops total .
 location: Serbia; organization: Central Powers; location: Bulgaria
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: Serbia, Central Powers, Bulgaria 
Answer:
 location: Serbia; organization: Central Powers; location: Bulgaria