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If they use the d mark in Serbia , obviously there would be essentially the same system that they have in Montenegro and if they had a currency board with a foreign national running the thing , like Bosnia , it would essentially mean that they had a unified system was what they have in Montenegro because with Montenegro , they would still have the d mark as legal tender , but they would also use this new currency board money from Serbia and there would be absolutely no problem , and furthermore , from a regional point of view , you 'd have essentially most of the Balkans in a unified currency zone because Bulgaria has a currency board that 's d mark based .
 geographical social political: Serbia; geographical social political: Montenegro; geographical social political: Bosnia; geographical social political: Montenegro; geographical social political: Montenegro; geographical social political: Serbia; location: Balkans; geographical social political: Bulgaria
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 geographical social political: Serbia; geographical social political: Montenegro; geographical social political: Bosnia; geographical social political: Montenegro; geographical social political: Montenegro; geographical social political: Serbia; location: Balkans; geographical social political: Bulgaria