what is the name of organism in the first foreign body microbiology test of patient 24894 until 57 months ago?
select microbiologyevents.org_name from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 24894 ) and microbiologyevents.spec_type_desc = 'foreign body' and microbiologyevents.org_name is not null and datetime(microbiologyevents.charttime) <= datetime(current_time,'-57 month') order by microbiologyevents.charttime asc limit 1