Question: Which of the founder of Basque artistic group was a Spanish Basque sculptor?
Sentence (from "Gaur (artistic group)"): Gaur ('today' in Basque) was a Basque artistic group founded in 1966 by Amable Arias, Rafael Ruiz Balerdi, Nestor Basterretxea, Eduardo Chillida, Remigio Mendiburu, Jorge Oteiza, José Antonio Sistiaga, and José Luis Zumeta.
Relevant evidence: Yes