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: 'be city in', Sentence: 'Mumbai is the second most populous city in India and the country 's chief principal west seaport .'
city

Given Relationship: 'be mayor of', Sentence: 'And former New York mayor Rudy Giuliani suggested men of a certain age get checked for prostate cancer , following in the footsteps of former US senator Bob Dole , whose appearances in Viagra ads are credited with persuading more men to discuss erectile dysfunction with their doctors .'
mayor

Given Relationship: 'be region of', Sentence: 'The Murcia region of Spain on the Costa Blanca is benefiting from huge investment .'

region