user: Question: What is the size that has Nickel as the metal, and One Rupee as the denomination?
Columns: ['Denomination', 'Metal', 'Weight', 'Shape', 'Size']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['One Rupee', 'Nickel', '10 g', 'Circular', '28mm']
SQL:

assistant: SELECT "Size" FROM "Table" WHERE "Metal" = 'Nickel' AND "Denomination" = 'One Rupee';