user: Question: What is Written By, when Originalairdate is 25 April 1993?
Columns: ['Episode #', 'Title', 'Directed by', 'Written by', 'Originalairdate']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '" Artists in Crime "', 'Silvio Narizzano', 'T.R. Bowen', '23 December 1990']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "Originalairdate" = '25 April 1993';