Answer the following question: Information: - The Comite International du Ski-Alpinisme de Competition (CISAC) was the international committee of competition ski mountaineering and was founded in 1991. - Les Portes du Soleil (French for "The Doors of the Sun") is a major skisports destination in the Alps, encompassing thirteen resorts between Mont Blanc in France and Lake Geneva in Switzerland. With more than 650km of marked pistes (claimed by the lift companies; an independent expert measured about 426km ) and about 200 lifts in total, spread over 14 valleys and about , Portes du Soleil ranks among the two largest ski areas in the world (the other being Les Trois Vallees). Almost all of the pistes are connected by lifts a few marginal towns can be reached only by the free bus services in the area. The highest point of skiing is 2400m and the lowest is 900m. As with many other Alpine ski resorts, the lower slopes of the Portes du Soleil have snow-making facilities to extend the skiable season by keeping the lower slopes open during the warmer months. - The International Council for Ski Mountaineering Competitions (ISMC) located in the "Floridablanca 84" in Barcelona was part of the Union Internationale des Associations d'Alpinisme (UIAA) and responsible for ski mountaineering and vertical race competitions. The ISMC, which was founded in 1999 as follow-up institution of the Comite International du Ski-Alpinisme de Competition (CISAC), merged into the International Ski Mountaineering Federation (ISMF) in 2008. - The 2008 World Championship of Ski Mountaineering was the fourth World Championship of Ski Mountaineering sanctioned by the International Council for Ski Mountaineering Competitions ( ISMC ) , held in Portes du Soleil , Switzerland , from February 23 to February 29 , 2008 . About 450 athletes of 29 nations participated . Compared to the former world masterships a long distance race was added . - A Vertical Race is a special kind of ski mountaineering without the typical downhill skiing after ascending. At the mountain running and climbing passages the runners have to carry their skis in their backpacks. Vertical Races for women and men are part of all international ski mountaineering competitions of the International Council for Ski Mountaineering Competitions (ISMC) as well as at many national competitions. The Union Internationale des Associations d'Alpinisme (UIAA)is working toward the goal of having Vertical Race become an Olympic discipline at the 2018 Winter Olympics, . - Ski mountaineering is a skiing discipline that involves climbing mountains either on skis or carrying them, depending on the steepness of the ascent, and then descending on skis. There are two major categories of equipment used, free-heel Telemark skis and skis based on Alpine skis, where the heel is free for ascents, but is fixed during descent. The discipline may be practiced recreationally or as a competitive sport. After reading the paragraphs above, we are interested in knowing the entity with which '2008 world championship of ski mountaineering' exhibits the relationship of 'sport'. Find the answer from the choices below. Choices: - climbing - running - ski mountaineering - skiing
Answer:
skiing