user: Question: What class is the verb wich its part 4 is frosinn
Columns: ['Class', 'Part 1', 'Part 2', 'Part 3', 'Part 4', 'Verb meaning']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'ríða', 'reið', 'riðu', 'riðinn', 'to ride']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Part 4" = 'frosinn';