Utilize the input text as a context reference, choose the right relationship between Michael Corbat and Citigroup from the options. Options: 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.

"Our results for the quarter show very balanced performance across our business lines," said Citigroup chief executive Michael Corbat in a statement.

Answer: employer