user: Question: Tell me the class for Admiral and HMS Frobisher
Columns: ['Ship', 'Guns', 'Class', 'Captain', 'Rank', 'Year']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['HMS Manxman', '80', 'Third-rate ship of the line', 'Captain Sir Henry Langford', 'Midshipman', '1768–1772']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Rank" = 'Admiral' AND "Ship" = 'HMS Frobisher';