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.

Input: Consider 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 .'

Output: service

Input: Consider Input: Given Relationship: 'follow at', Sentence: 'Interment will follow at Oakwood Cemetery under the direction of Stout Funeral Home .'

Output: follow

Input: Consider Input: Given Relationship: 'surrender to', Sentence: 'American independence from Britain was assured when George Washington forced Lord Cornwallis to surrender at Yorktown , Virginia , in 1781 .'
Output: surrender