user: Question: What is the quantity of class B V?
Columns: ['Class', 'Number(s)', 'Quantity', 'Year(s) of Manufacture', 'Type']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['A I', 'names', '24', '1844–1845', '1A1 n2']
SQL:

assistant: SELECT "Quantity" FROM "Table" WHERE "Class" = 'B V';