What is the relationship between Bob Dudley and Chief Executive Officer 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.

"Our work to increase efficiency and reduce costs is embedding sustainable benefits throughout the Group and we continue with capital discipline and divestments," Chief Executive Officer Bob Dudley said in a statement.

Answer: position_held