user: Question: What Region is the MHCL-20004 Catalog?
Columns: ['Region', 'Date', 'Label', 'Format', 'Catalog']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Japan', 'May 25, 1979', 'Alfa Records', 'stereo LP', 'ALR-6017']
SQL:

assistant: SELECT "Region" FROM "Table" WHERE "Catalog" = 'MHCL-20004';