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.
In the context of the input sentence, determine the relationship between 'Citigroup' and 'financial services'.
Options: location of formation, publisher, director/manager, industry