until 2100 what is the three most commonly prescribed drug for patients 30s?
select t1.drug from ( select prescriptions.drug, dense_rank() over ( order by count(*) desc ) as c1 from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.age between 30 and 39 ) and strftime('%y',prescriptions.startdate) <= '2100' group by prescriptions.drug ) as t1 where t1.c1 <= 3