user: Question: What is the coin that weighs 3 g made of?
Columns: ['Value', '€ equiv.', 'Diameter', 'Weight', 'Composition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1 ₧', '0.006 (0.01)', '14mm', '0.55 g', 'Aluminium']
SQL:

assistant: SELECT "Composition" FROM "Table" WHERE "Weight" = '3 g';