user: Question: Who played in the men's singles during the tournament where Ragna Ingolfsdottir played in the women's singles?
Columns: ['Year', "Men's singles", "Women's singles", "Men's doubles", "Women's doubles", 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1993.0, 'Jim Laugesen', 'Mette Sørensen', 'Neil Cottrill John Quinn', 'Nadezhda Chervyakova Marina Yakusheva', 'John Quinn Nicola Beck']
SQL:

assistant: SELECT "Men's singles" FROM "Table" WHERE "Women's singles" = 'Ragna Ingolfsdottir';