Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

[Q]: Sentence: 'Florence is the city that gave birth to the Renaissance and people come here to trace the development of this extraordinary place called Florence or Firenze by the Italians .', Argument/Subject 1: 'florence', Argument/Subject 2: 'renaissance'
[A]: be city of


[Q]: Sentence: 'Agence France-Presse reports that the executive director of UNICEF , Carol Bellamy , has expressed her concern about the impact that the flight of people from Kandahar can have on children .', Argument/Subject 1: 'carol bellamy', Argument/Subject 2: 'unicef'
[A]: be director of


[Q]: Sentence: 'HIV causes AIDS by killing T-cells .', Argument/Subject 1: 'hiv', Argument/Subject 2: 'aid'
[A]:
cause