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.

[EX Q]: Given Relationship: 'surrender at', Sentence: 'When Cornwallis surrendered at Yorktown it is said while the British played The World Turned Upside Down , the Americans played Yankee Doodle .'
[EX A]: surrendered

[EX Q]: Given Relationship: 'be focus of', Sentence: 'The Glaucoma Research Center at Wills Eye Institute focuses and coordinates these efforts to discover and disseminate sight-saving knowledge around the world .'
[EX A]: focuses

[EX Q]: Given Relationship: 'be city of', Sentence: 'Toronto has been touted as the most ethnically diverse city in Canada , if not the world .'
[EX A]:
city