user: Question: From what catalog was the release that happened on April 12, 1968, and in LP format?
Columns: ['Date', 'Label', 'Format', 'Country', 'Catalog']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['January 15, 1968', 'Columbia', 'LP', 'US', 'CL 2775']
SQL:

assistant: SELECT "Catalog" FROM "Table" WHERE "Format" = 'LP' AND "Date" = 'April 12, 1968';