Analyze the relationship between 'Sergio Marchionne' and 'Fiat' within the context of the input sentence.
Options: business division, chief executive officer, founded by, employer

TURIN, July 3 Consolidation continues to be necessary in the auto industry but there is nothing new to report on Fiat Chrysler's desire for a tie-up with General Motors, FCA CEO Sergio Marchionne said on Friday.
employer