instruction: in 2105, what are the top five most commonly prescribed drugs for patients 60 or above?
response: SELECT t1.drugname FROM (SELECT medication.drugname, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM medication WHERE medication.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.age >= 60) AND STRFTIME('%y', medication.drugstarttime) = '2105' GROUP BY medication.drugname) AS t1 WHERE t1.c1 <= 5