what was the medication that patient 50286 was prescribed for the last time through the im route in 11/last year?
select prescriptions.drug from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 50286 ) and prescriptions.route = 'im' and datetime(prescriptions.startdate,'start of year') = datetime(current_time,'start of year','-1 year') and strftime('%m',prescriptions.startdate) = '11' order by prescriptions.startdate desc limit 1