what was patient 89565's first urine microbiology test time on the last hospital visit.
select microbiologyevents.charttime from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 89565 and admissions.dischtime is not null order by admissions.admittime desc limit 1 ) and microbiologyevents.spec_type_desc = 'urine' order by microbiologyevents.charttime asc limit 1