Table:
0
A
B
C
D
E
1
Player
Country
Year(s) won
Total
To par
2
Mark O'Meara
United States
1998
146
+2
3
Jack Nicklaus
United States
1966 , 1970 , 1978
147
+3
4
Ben Curtis
United States
2003
148
+4
5
Todd Hamilton
United States
2004
148
+4
6
Nick Price
Zimbabwe
1994
148
+4
7
Tony Jacklin
England
1969
155
+11
8
David Duval
United States
2001
157
+13

Questions and formulas:
Question: What country won in 2004?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1=2004),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,C2:C8=2004),2))
Level: medium