What is the relationship between Covestro and Bayer in the context of the input sentence. Choose an answer from: 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 AG still plans to list its Covestro plastics unit on the stock market this year, undeterred by volatility that sent indexes in Europe down the most since 2008, according to people familiar with the matter.
owned_by