Utilize the input text as a context reference, choose the right relationship between Chanda Kochhar and ICICI Bank 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.

"I was pleasantly surprised when I got a call from ICICI Bank CEO Chanda Kochhar with an offer to be the nonexecutive chairman of ICICI.
employer