user: Question: Which chassis had an entrant of John Mecom?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Engine', 'Tyre', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Scuderia Ferrari SpA SEFAC', 'Ferrari', '156', 'Ferrari 178 1.5 V6', 'D', 'Phil Hill', '1–3, 5–7']
SQL:

assistant: SELECT "Chassis" FROM "Table" WHERE "Entrant" = 'John Mecom';