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.

Example Input: Given Relationship: 'recognize independence of', Sentence: 'Russia recognized August 26 independence of South Ossetia and Abkhazia and then inked the Friendship and Cooperation Treaties providing for deployment of military bases on their soil .'
Example Output: independence

Example Input: Given Relationship: 'join', Sentence: 'Why did Denmark join the European Union in 1973 ?'
Example Output: join

Example Input: Given Relationship: 'be alternative to', Sentence: 'Last month we discussed Ogg Vorbis , the open source alternative to the popular MP3 audio format .'
Example Output:
alternative