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 creator of', Sentence: 'Bjarne Stroustrup is the creator of C++ , one of the most widely used languages that allows object-oriented programming .'
creator

Given Relationship: 'be capital city of', Sentence: 'Nagano is the capital city of Nagano Prefecture , situated near the junction of the Chikuma River and the Sai River on the island of Honshu , Japan .'
capital

Given Relationship: 'be introduce in', Sentence: 'A Bill is then introduced into the House of Commons or House of Representatives or the House of Lords or Senate .'

introduced