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A worsening five-year political crisis in Bolivia reached a precarious impasse on Wednesday , with left - and right-wing adversaries so polarized that the departing president , Carlos Mesa , warned his country to step back from the brink of civil war .
 nationality: Carlos Mesa, Bolivia
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Carlos Mesa, Bolivia 
Answer:
 nationality: Carlos Mesa, Bolivia