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

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