Citigroup Will Close Banamex USA Bank will pay regulators $140 million over unit’s money-laundering controls By christina.rexrode@wsj.com Updated July 22, 2015 3:29 p.m.
In the context of the input sentence, determine the relationship between 'Banamex' and 'Citigroup'.
Options: stock exchange, chairperson, legal form, operator