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.

Q: 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 .'

A: service
****
Q: Given Relationship: 'endorse', Sentence: 'Colin Powell endorsed Obama because he 's black .'

A: endorsed
****
Q: Given Relationship: 'elect', Sentence: 'Elected National President of the Progressive Conservative Association of Canada .'

A:
Elected
****