309085
Though occupied Serbia was eventually to produce more grain than Romania , food supplies to soldiers in the field remained a persistent and crucial worry to those at the higher echelons of the War Ministry .
 location: Serbia; location: Romania
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, Romania 
Answer:
 location: Serbia; location: Romania