Utilize the input text as a context reference, choose the right relationship between Ram pickup and Chrysler 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.

Fiat Chrysler must offer to buy back from customers more than 500,000 Ram pickup trucks and other vehicles in the biggest such action in US history.

Answer: manufacturer