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In  Canada  's general election on Monday Conservative Party leader  Stephen Harper  and his party are posing a strong challenge to incumbent Prime Minister Paul Martin and his Liberal Party .
 Canada, Stephen Harper
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 Canada, Stephen Harper