instruction:
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.
question:
Given Relationship: 'begin at', Sentence: 'Early 1861 : Some speculate that the Civil War could have begun in Florida instead of Fort Sumter , South Carolina .'
answer:
begun


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


question:
Given Relationship: 'be city in', Sentence: 'Montreal and Quebec City are Quebec 's largest cities . Montreal is a beautiful city renowned for its nightlife and world-class restaurants .'
answer:

city