Task: Text to Code
Input (English): SQL: SELECT T2.treatment_type_description FROM Charges AS T1 JOIN Treatment_Types AS T2 JOIN Treatments AS T3 GROUP BY T3.treatment_type_code ORDER BY Avg ( T1.charge_amount ) Asc LIMIT 1
Feedback: the total cost of treatment need to be supplant in place of the id of average professional.
Output (English): SELECT T1.treatment_type_description FROM Treatment_types AS T1 JOIN Treatments AS T2 ON T1.treatment_type_code  =  T2.treatment_type_code GROUP BY T1.treatment_type_code ORDER BY sum(cost_of_treatment) ASC LIMIT 1