Information: - The International Bobsleigh and Skeleton Federation (IBSF), originally known by the French name "Federation Internationale de Bobsleigh et de Tobogganing" (FIBT), is the international sports federation for bobsleigh and skeleton. It acts as an umbrella organization for 14 national bobsleigh and skeleton associations . It was founded on November 23, 1923 by the delegates of Great Britain, France, Switzerland, Canada and the United States at the meeting of their first International Congress in Paris, France. In June 2015, it announced a name change from FIBT to IBSF. The federation's headquarters are in Lausanne, Switzerland. - The IBSF World Championships (originally named the FIBT World Championships until 2015), part of the International Bobsleigh and Skeleton Federation, have taken place on an annual basis in non-Winter Olympic years since 1930. A two-man event was included in 1931 with a combined championship occurring in 1947. Men's skeleton was introduced as a championship of its own in 1982 while women's bobsleigh and skeleton events were introduced in 2000. Both the women's bobsleigh and skeleton events were merged with the men's bobsleigh events at the 2004 championships. A mixed team event, consisting of one run each of men's skeleton, women's skeleton, 2-man bobsleigh, and 2-women bobsleigh debuted in 2007. - Hans Bolli was a Swiss bobsledder who competed in the early 1950s . He won two bronze medals in the four - man event at the FIBT World Championships ( 1950 , 1951 ) . Given the information above, choose from the list below the object entity that exhibits the relation 'country of citizenship' with the subject 'hans bolli'. Choices: - canada - great britain - switzerland
The answer to this question is:
switzerland