Utilize the input text as a context reference, choose the right relationship between 'Goldman Sachs' and 'Lloyd Blankfein' from the options.
Options: legal form, member of, chief executive officer, publisher

In a memo signed “Lloyd,” Goldman Sachs CEO Lloyd Blankfein revealed he’s been diagnosed with lymphoma but added that it had been determined to be a “highly curable” type of the cancerous disease.
chief executive officer