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.
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Question: Given Relationship: 'be mayor of', Sentence: 'Former New York City mayor Rudy Giuliani joined in the mockery .'

Answer: mayor

Question: Given Relationship: 'be wife of', Sentence: 'Michelle Obama , wife of Democratic Presidential candidate Barack Obama , acknowledges the crowd at the Democratic National Convention 2008 at the Pepsi Center in Denver , Colorado , on August 25 , 2008 .'

Answer: wife

Question: Given Relationship: 'offer in', Sentence: 'The Mathematics Department also offers a comprehensive major in physics mathematics and minors in liberal arts , actuarial science , teaching and middle childhood/early adolescence teaching .'

Answer:
offers