question: What is the smallest rate of burglary when forcible rape is 39.1 and motor vehicle theft is less than 568.8?
answer: SELECT MIN(burglary) FROM table_name_90 WHERE forcible_rape = "39.1" AND motor_vehicle_theft < 568.8
context: CREATE TABLE table_name_90 (burglary INTEGER, forcible_rape VARCHAR, motor_vehicle_theft VARCHAR)