What is the relationship between Yello and Chicago in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Yello announced the change of their corporate identity during their recent Recruiting Solutions Conference hosted in Chicago and the move has been met with much praise, as it better represents the ability for their corporate partners to better engage with candidates.

Answer: headquarters_location