user: Question: Which Country has a FIS Nordic World Ski Championships of 1948, 1950?
Columns: ['Winner', 'Country', 'Winter Olympics', 'FIS Nordic World Ski Championships', 'Holmenkollen']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Thorleif Haug', 'Norway', '1924', '1924', '1919, 1920, 1921']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "FIS Nordic World Ski Championships" = '1948, 1950';