Question: Which of the founder of Basque artistic group was a Spanish Basque sculptor?

full_context: Document 1: ETA (separatist group): ETA (] , ] ), an acronym for Euskadi Ta Askatasuna (] ; "Basque Homeland and Liberty"), is a formerly armed leftist Basque nationalist and separatist organization in the Basque Country (in northern Spain and southwestern France). The group was founded in 1959 and later evolved from a group promoting traditional Basque culture to a paramilitary group engaged in a violent campaign of bombing, assassinations and kidnappings in the Southern Basque Country and throughout Spanish territory. Its goal was gaining independence for the Basque Country. ETA is the main group within the Basque National Liberation Movement and is the most important Basque participant in the Basque conflict.
Document 2: Santiago Calatrava: Santiago Calatrava Valls (born 28 July 1951) is a Spanish architect, structural engineer, sculptor and painter, particularly known for his bridges supported by single leaning pylons, and his railway stations, stadiums, and museums, whose sculptural forms often resemble living organisms. His best-known works include the Milwaukee Art Museum, the Turning Torso tower in Malmö, Sweden, the Margaret Hunt Hill Bridge in Dallas, Texas, and his largest project, the City of Arts and Sciences and Opera House, in his birthplace, Valencia. His architectural firm has offices in New York City, Doha, and Zürich.
Document 3: Jesús Guridi: Jesús Guridi Bidaola (25 September 1886 – 7 April 1961) was a Spanish Basque composer who was a key player in 20th century Spanish and Basque music. His style fits into the late Romantic idiom, directly inherited from Wagner, and with a strong influence from Basque culture. Among his best known works are the zarzuela "El Caserío", the opera "Amaya", the orchestral work "Ten Basque Melodies" and his organ works, where the "Triptych of the Good Shepherd" can be highlighted.
Document 4: Eduardo Chillida: Eduardo Chillida Juantegui, or Eduardo Txillida Juantegi in Basque, (10 January 1924 – 19 August 2002) was a Spanish Basque sculptor notable for his monumental abstract works.
Document 5: Goxua: Goxua (which means "sweet" in Basque) is a typical dessert from the Basque Country, especially from Vitoria-Gasteiz. Gasteiz pastry chef Luis Lopez de Sosoaga claims to have first created the dessert in 1977.
Document 6: Generation of '27: The Generation of '27 (Spanish: "Generación del 27" ) was an influential group of poets that arose in Spanish literary circles between 1923 and 1927, essentially out of a shared desire to experience and work with avant-garde forms of art and poetry. Their first formal meeting took place in Seville in 1927 to mark the 300th anniversary of the death of the baroque poet Luis de Góngora. Writers and intellectuals paid homage at the "Ateneo de Sevilla", which retrospectively became the foundational act of the movement.
Document 7: Punk rock in Spain: In Spain, the punk rock scene emerged in 1978, when the country had just emerged from forty years of fascist dictatorship under General Franco, a state that “melded state repression with fundamentalist Catholic moralism”. Even after Franco died in 1975, the country went through a “volatile political period”, in which the country had to try to relearn democratic values and install a constitution. When punk emerged, it “did not appropriate socialism as its goal”; instead, it embraced “nihilism”, and focused on keeping the memories of past abuses alive, and accusing all of Spanish society of collaborating with the fascist regime.
Document 8: 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. The avant-guard group, based in Gipuzkoa, Spain, provided the springboard for a wide Basque artistic movement with close links to influential social, cultural and political agents in the Basque Country opposed to Franco's dictatorship during the 70s and early 80s.
Document 9: Edu Espada: Eduardo 'Edu' Espada Gallardo (born 8 March 1981 in Los Corrales, Seville) is a retired Spanish footballer who played as a striker.
Document 10: Mariana Castillo Deball: Mariana Castillo Deball (born 1975 in Mexico City) is an artist who studied in the Universidad Nacional Autónoma de México, Mexico City and the Jan Van Eyck Academie in Maastricht. She is currently based in Berlin. In 2009, she was awarded the Ars Viva prize, which has been presented by the Kulturkreis der deutschen Wirtschaft im BDI (Association of Arts and Culture of the German Economy at the Federation of German Industries) every year since 1953, and is awarded to young visual artists who live and work in Germany. Castillo Deball uses installation, sculpture, photography and drawing to explore the role objects play in our understanding of identity and history. Engaging in prolonged periods of research and field work, she takes on the role of the explorer or the archaeologist, compiling found materials in a way that reveals new connections and meanings. In Castillo Deball's 2013 work Stelae Storage, Plaster casts copied from monolithic Mayan stone sculptures called stelae are displayed on metal racks similar to those found in a museum's storage area. In a similar work, Lost Magic Kingdoms Paolozzi (2013), Castillo Deball culled photographic reproductions from the personal archives of late Scottish artist Eduardo Paolozzi, who mixed pop and ethnographic references.
Document 11: Acción Española: Acción Española (] , "Spanish Action") or AE was a Spanish cultural association active during the Second Spanish Republic, meeting point of the ultraconservative and far right intellectual figures that endorsed the restoration of the Monarchy. It was also a political magazine of the same name. The group was heavily influenced by "Action Française" both in its name and its ideology. Constituted in October 1931, the cultural association was inaugurated on 5 February 1932, following the founding of the journal on 15 December 1931.
Document 12: Topos V: Topos V, or simply Topos, is a sculpture by the Basque artist Eduardo Chillida, standing at Plaça del Rei in the Gothic Quarter of Barcelona.
Document 13: Alberto Peral: Alberto Peral (born 1966, Santurtzi, Biscay) is a Basque artist. He began to highlight in the principle of the 90s. Since his first individual exhibition at the Fundació Joan Miró in Barcelona in 1992, he has created a conceptual route that has brought him to move through a big diversity of mediums, like drawing, photography or sculpture.
Document 14: North Group: The North Group was an intellectual community comprising various writers, artists, philosophers, politicians, and intellectuals from Northern Peru, especially from the La Libertad Region. It was founded in 1915 in the city of Trujillo. At first known as the "Bohemians of Trujillo," the community adopted the name "the North Group" in 1923. Early leaders included journalist Antenor Orrego and poet José Eulogio Garrido. Its most prominent members included poet Cesar Vallejo, politician Victor Raul Haya de la Torre, Alcides Spelucín, Macedonio de la Torre, Juan Espejo Asturrizaga, Francisco Xandóval, and Ciro Alegría. This group inspired the work of Eduardo González Viaña, one of its modern successors.
Document 15: Ana Laura Aláez: Ana Laura Aláez (Bilbao, 1964) is a Basque artist. She is one of the most renowned contemporary artists in Spain. She defines herself as an "emotions architect", as she transforms all her life into art, depicting her feelings in her artworks. One of her first exhibitions took place in 1992, in Fundació Joan Miró's Espai 10, in Barcelona. Alberto Peral, another Basque artist, was also featured in this exhibition.
ground_truth: Eduardo Chillida