Information:  - 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.  - Alpine Ski () is an Alpine skiing arcade game, released by Taito in 1981.  - The World Championships of Ski Mountaineering are biannually held ski mountaineering competitions .  - The term mountaineering describes the sport of mountain climbing, including ski mountaineering. Hiking in the mountains can also be a simple form of mountaineering when it involves scrambling, or short stretches of the more basic grades of rock climbing, as well as crossing glaciers.    After reading the paragraphs above, we are interested in knowing the entity with which 'world championships of ski mountaineering' exhibits the relationship of 'sport'. Find the answer from the choices below.  Choices: - mountaineering  - rock climbing  - ski mountaineering  - skiing  - sport
The answer to this question is:
skiing