instruction: what's the name of the drug that was first prescribed to patient 3229 in 12/2105?
response: SELECT prescriptions.drug FROM prescriptions WHERE prescriptions.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 3229) AND STRFTIME('%y-%m', prescriptions.startdate) = '2105-12' ORDER BY prescriptions.startdate LIMIT 1