user: ### NOW ANSWER:
Question: Which authority has a rocket launch called Rehbar-5?
Columns: ['Rocket launch', 'Launch Date', 'Mission', 'Institutional authority', 'Launch Site', 'Outcomes', 'Derivatives']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Rehbar-I', 'June 7, 1962; 14:45 GMT', 'Aeronomy', 'SUPARCO', 'Sonmiani Terminal', 'Level 1; Success', 'Nike-Cajun']
SQL:

assistant: SELECT COUNT("Derivatives") FROM "Table" WHERE "Rocket launch" = 'Rehbar-5';