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: 'run', Sentence: 'Run Linux within Virtual PC within Mac OS X ...'
[EX A]: Run

[EX Q]: Given Relationship: 'be son of', Sentence: 'Peter is called son of John in John 21:15 and Barjona in Matt 16 :17 .'
[EX A]: son

[EX Q]: Given Relationship: 'return to', Sentence: 'Then John rode off into the northern January cold of 1777 to return to Philadelphia .'
[EX A]:
return