when was last time patient 9038 was prescribed a medication via right eye route in 04/last year?
select prescriptions.startdate from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 9038 ) and prescriptions.route = 'right eye' and datetime(prescriptions.startdate,'start of year') = datetime(current_time,'start of year','-1 year') and strftime('%m',prescriptions.startdate) = '04' order by prescriptions.startdate desc limit 1