From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.
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Question: Given Relationship: 'be leader of', Sentence: 'Kadima has now drawn even with the Likud in some recent polls despite the fact that Kadima leader Tzipi Livni has the unnerving habit of telling the truth , even when her views do not coincide with those of most Israelis .'

Answer: leader


Question: Given Relationship: 'be country in', Sentence: 'Ukraine , a beautiful country in Eastern Europe , presents not only gorgeous landscapes , but most sex-appealing girls .'

Answer: country


Question: Given Relationship: 'be service of', Sentence: 'See a list of publications by Mayo Clinic authors on mitral valve disease on PubMed , a service of the National Library of Medicine .'

Answer:
service