user: Question: What vfl club(s) for players ranked Sergeant, 8th Brigade Australian Field Artillery at time of death?
Columns: ['Player', 'VFL Games', 'VFL Club(s)', 'Rank held at time of death', 'Date of death', 'Location']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['James Aitken', 1.0, 'Geelong', 'Private, 5th Battalion, First A.I.F.', '8 August 1915', 'Gallipoli , Turkey']
SQL:

assistant: SELECT "VFL Club(s)" FROM "Table" WHERE "Rank held at time of death" = 'Sergeant, 8th Brigade Australian Field Artillery';