user: Question: What are the colours of the team with Benedikt Guðmundsson as head coach?
Columns: ['Team', 'City, Region', 'Arena', 'Colours', 'Head coach']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Fjölnir', 'Grafarvogur , Reykjavík', 'Dalhús', 'yellow/blue', 'Hjalti Vilhjálmsson']
SQL:

assistant: SELECT "Colours" FROM "Table" WHERE "Head coach" = 'Benedikt Guðmundsson';