Question: When was the merger of Fiat S.p.A. into a new holding company, FCA  became effective?
Sentence (from "Fiat S.p.A."): Fiat S.p.A., or "Fabbrica Italiana Automobili Torino" (Italian Automobile Factory of Turin), was an Italian holding company whose original and core activities were in the automotive industry, and that was succeeded by Fiat Chrysler Automobiles NV (FCA).
Relevant evidence: Yes