Question: What nationality is the director of the film, in which Maribel Verdú appeared as Mercedes ? 
Sentence (from "Pan's Labyrinth"): Pan's Labyrinth (Spanish: El laberinto del fauno , 'The Labyrinth of the Faun' ) is a 2006 Spanish-Mexican dark fantasy film written and directed by Mexican filmmaker Guillermo del Toro.
Relevant evidence: Yes