context: In the early 20th century Valencia was an industrialised city. The silk industry had disappeared, but there was a large production of hides and skins, wood, metals and foodstuffs, this last with substantial exports, particularly of wine and citrus. Small businesses predominated, but with the rapid mechanisation of industry larger companies were being formed. The best expression of this dynamic was in the regional exhibitions, including that of 1909 held next to the pedestrian avenue L'Albereda (Paseo de la Alameda), which depicted the progress of agriculture and industry. Among the most architecturally successful buildings of the era were those designed in the Art Nouveau style, such as the North Station (Gare du Nord) and the Central and Columbus markets.
question: ఆర్ట్ నౌవే శైలిలో ఏ మార్కెట్లు నిర్మించబడ్డాయి?
answers: Central and Columbus