Which of these is NOT one of Spain’s officially recognized languages?
There are five official languages of Spain, but the most prominent one is Castilian, the official name for the standard form of Spanish spoken around the world. The language originated in central Spain, and it is the only language that every region of Spain uses regularly. Other regional languages spoken in Spain include Catalan, Galician, Basque, and Aranese (the latter of which has only about 3,000 native speakers left).
Source: Tatutrad