instruction: what is the last careunit of patient 47224 in their first hospital visit?
response: SELECT transfers.careunit FROM transfers WHERE transfers.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 47224 AND NOT admissions.dischtime IS NULL ORDER BY admissions.admittime LIMIT 1) AND NOT transfers.careunit IS NULL ORDER BY transfers.intime DESC LIMIT 1