what is the name of the specimen test which patient 5878 has last received on the last hospital encounter?
select microbiologyevents.spec_type_desc from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 5878 and admissions.dischtime is not null order by admissions.admittime desc limit 1 ) order by microbiologyevents.charttime desc limit 1