61153
Ports along the Danube and the Black Sea are the most important concerning Bulgaria 's water transport system .
 location: Danube; location: Black Sea; 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: Danube, Black Sea, Bulgaria 
Answer:
 location: Danube; location: Black Sea; location: Bulgaria