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.

Given Relationship: 'run on', Sentence: 'The Xen Dom0 is running Linux CentOS 5.2 on Intel Xeon CPUs with VT extensions .'
running

Given Relationship: 'run', Sentence: 'Run Linux within Virtual PC within Mac OS X ...'
Run

Given Relationship: 'be capital of', Sentence: 'Rio was once the capital of Brazil .'

capital