user: ### NOW ANSWER:
Question: What is Fleet Number(s), when Quantity Preserved is "0", when Quantity Made is 1, and when Class is "Z"?
Columns: ['Class', 'Wheel arrangement', 'Fleet number(s)', 'Quantity made', 'Quantity preserved']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2-6-0 — oOOO — Mogul', '2-6-0 — oOOO — Mogul', '2-6-0 — oOOO — Mogul', '2-6-0 — oOOO — Mogul', '2-6-0 — oOOO — Mogul']
SQL:

assistant: SELECT "Fleet number(s)" FROM "Table" WHERE "Quantity preserved" = '0' AND "Quantity made" = '1' AND "Class" = 'Z';