Table:
0
A
B
C
D
E
1
Winner
Country
Winter Olympics
FIS Nordic World Ski Championships
Holmenkollen
2
Thorleif Haug
Norway
1924
1924
1918, 1919, 1920, 1921, 1923, 1924
3
Nils Karlsson
Sweden
1948
1948
1947, 1951
4
Ole Ellefsæter
Norway
1968
1968
1967
5
Pål Tyldum
Norway
1972
1972
1969, 1972
6
Thomas Wassberg
Sweden
1984
1982
1980, 1982, 1987
7
Gunde Svan
Sweden
1988
1985, 1989
1986, 1990
8
Petter Northug
Norway
2010
2009
2010

Questions and formulas:
Question: What country was ole ellefsæter from?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="ole ellefsæter"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,A2:A8="ole ellefsæter"),2))
Level: medium
Question: Who won the FIS Nordic World Ski Championships in 1972?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1=1972),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,D2:D8=1972),1))
Level: medium