user: Question: When 5A06 is the production code what is the highest episode?
Columns: ['Ep.', 'Season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Prod. Code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [30.0, 1.0, '"The Thief"', 'Noam Pitlik', 'Jeffrey Ferro & Fredric Weiss', 'September 26, 1986', '5A03']
SQL:

assistant: SELECT MAX("Ep.") FROM "Table" WHERE "Prod. Code" = '5A06';