What is the relationship between Lufthansa and Eurowings 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.

The union and management's dispute has resulted in 13 strikes over 18 months, with a row over retirement benefits escalating as Lufthansa began its Eurowings expansion drive.

Answer: subsidiary