user: Question: County town of Castlebar has the most populous city/town?
Columns: ['County', 'Irish name', 'County town', 'Most populous city/town', 'Province', 'Region']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['The 32 "traditional" counties', 'The 32 "traditional" counties', 'The 32 "traditional" counties', 'The 32 "traditional" counties', 'The 32 "traditional" counties', 'The 32 "traditional" counties']
SQL:

assistant: SELECT "Most populous city/town" FROM "Table" WHERE "County town" = 'Castlebar';