user: Question: Who were the umpires when Paul Medhurst (C) won the Simpson Medal?
Columns: ['Season', 'Premiers', 'Runners Up', 'Score', 'Captain', 'Coach', 'Simpson Medal', 'Venue', 'Attendance', 'Umpires']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [2001.0, 'East Perth', 'South Fremantle', '17.18 (120) – 5.8 (38)', 'Jeremy Barnard', 'Tony Micale', 'Ryan Turnbull (EP)', 'Subiaco Oval', 23842.0, 'C Hendrie , M Fussell , D Corcoran']
SQL:

assistant: SELECT "Umpires" FROM "Table" WHERE "Simpson Medal" = 'Paul Medhurst (C)';