instruction: what are the top five most common surgeries of patients of age 30s in 2101?
response: SELECT t1.treatmentname FROM (SELECT treatment.treatmentname, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM treatment WHERE treatment.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.age BETWEEN 30 AND 39) AND STRFTIME('%y', treatment.treatmenttime) = '2101' GROUP BY treatment.treatmentname) AS t1 WHERE t1.c1 <= 5