what was the name of the drug, which was prescribed to patient 25796 for the last time in the last hospital visit?
select prescriptions.drug from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 25796 and admissions.dischtime is not null order by admissions.admittime desc limit 1 ) order by prescriptions.startdate desc limit 1