user: Question: Who trained the representative whose presentation of credentials happened on February 24, 1950?
Columns: ['Representative', 'State', 'Training', 'Title', 'Appointment', 'Presentation of Credentials', 'Termination of Mission', 'Reason']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Gerald A. Drew', 'CA', 'Foreign Service Officer', 'Envoy', 'February 2, 1950', 'February 24, 1950', 'February 25, 1952', 'Relinquished charge']
SQL:

assistant: SELECT "Training" FROM "Table" WHERE "Presentation of Credentials" = 'February 24, 1950';