Question: When was the merger of Fiat S.p.A. into a new holding company, FCA  became effective?
Sentence (from "Fiat Automobiles"): Fiat Automobiles S.p.A. (FIAT, Italian: "Fabbrica Italiana Automobili Torino" , 'Italian Automobiles Factory, Turin' ) is the largest automobile manufacturer in Italy, a subsidiary of FCA Italy S.p.A., which is part of Fiat Chrysler Automobiles.
Relevant evidence: No