Question: Metrovías operates a transit metro system that first opened in which year ?
Sentence (from "Buenos Aires Underground"): The first section of this network (Plaza de Mayo-Plaza Miserere) opened in 1913, making it the 13th subway in the world, and first underground railway in Latin America, the Southern Hemisphere and the Spanish-speaking world, with the Madrid Metro opening five years later, in 1919.
Relevant evidence: Yes