user: Question: Who appointed the representative that had a Presentation of Credentials on March 25, 1976?
Columns: ['Representative', 'Title', 'Presentation of Credentials', 'Termination of Mission', 'Appointed by']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Robert L. Flanagin', "Chargé d'Affaires ad interim", 'Nov 25, 1975', 'Mar 25, 1976', 'Gerald Ford']
SQL:

assistant: SELECT "Appointed by" FROM "Table" WHERE "Presentation of Credentials" = 'March 25, 1976';