What is the relationship between Citigroup and financial services 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.

About half the recruits for senior-level openings at mid-size banks are people whose resumes lead with names including Citigroup Inc. and JPMorgan Chase & Co., estimates Robert Voth, managing director in the financial services group at Russell Reynolds Associates, a recruiting firm.

Answer: industry