user: Question: Which Appointed has a Presentation of Credentials on November 22, 1990
Columns: ['Representative', 'Title', 'Presentation of Credentials', 'Termination of Mission', 'Appointed by']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Malcolm R. Barnebey', "Chargé d'Affaires ad interim", 'October 29, 1981', 'June 23, 1983', 'Ronald Reagan']
SQL:

assistant: SELECT "Appointed by" FROM "Table" WHERE "Presentation of Credentials" = 'November 22, 1990';