user: Question: What was the production code of the episode directed by Rondell Sheridan? 
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Prod. code', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [44.0, 1.0, '"Psychic Eye for the Sloppy Guy"', 'Rich Correll', 'Marc Warren', 'October1,2004', 301.0, '4.8']
SQL:

assistant: SELECT "Prod. code" FROM "Table" WHERE "Directed by" = 'Rondell Sheridan';