Utilize the input text as a context reference, choose the right relationship between Covestro and Bayer 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.

Bayer advanced 1.8 percent after the chemicals company's plastics division Covestro said it aimed to raise about 2.5 billion euros in an initial public offering.

Answer: owned_by