Question: Who became president in 2015 of the country whose ambassador to the United States from 1910 to 1919 was Rómulo Sebastián Naón? 
Sentence (from "Rómulo Sebastián Naón"): Rómulo Sebastián Naón Peralta Martínez (1875–1941), was an Argentine lawyer, politician and Ambassador to the United States from 1910 to 1919.
Relevant evidence: Yes