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: 'be language of', Sentence: 'Portuguese is the official language of Brazil , and it is found in every school , newspaper , television broadcast and business transaction .'
Example Output: language

Example Input: 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 .'
Example Output: service

Example Input: Given Relationship: 'buy', Sentence: 'Cialis buy cialis order cialis buy cialis online . . Buy cialis pharmacy online .'
Example Output:
buy