instruction: what is the average cost of the hospital that lasix involves in 2102?
response: SELECT AVG(t1.c1) FROM (SELECT SUM(cost.cost) AS c1 FROM cost WHERE cost.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.patientunitstayid IN (SELECT medication.patientunitstayid FROM medication WHERE medication.drugname = 'lasix')) AND STRFTIME('%y', cost.chargetime) = '2102' GROUP BY cost.patienthealthsystemstayid) AS t1