user: Question: how many series have production code 8ACX05
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [148.0, 1.0, '" And Then There Were Fewer "', 'Dominic Polcino', 'Cherry Chevapravatdumrong', 'September26,2010', '8ACX01/8ACX02', '9.41']
SQL:

assistant: SELECT COUNT("No. in series") FROM "Table" WHERE "Production code" = '8ACX05';