Utilize the input text as a context reference, choose the right relationship between 'Citigroup' and 'insurance' from the options.
Options: product/material produced, employer, position held, founded by

The “bad-bank” unit of Citigroup Inc., Citi Holdings for more than six years has been the repository for businesses the banking giant wanted to dump: its retail brokerage and life insurance unit, an array of toxic subprime loans, even a stake in a Mexican auto supplier.
product/material produced