Take context from the input text and decide on the accurate relationship between 'Citigroup' and 'financial services' from the options provided.
Options: location of formation, director/manager, industry, publisher

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.
industry