What is the relationship between Lloyd Blankfein 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.

(Reuters) - Goldman Sachs Group Inc Chief Executive Officer Lloyd Blankfein said on Tuesday he had a "highly curable" form of lymphoma, and would be able to work substantially as normal during treatment.

Answer: position_held