what was the organism found in the first blood culture of patient 65569?
select microbiologyevents.org_name from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 65569 ) and microbiologyevents.spec_type_desc = 'blood culture' and microbiologyevents.org_name is not null order by microbiologyevents.charttime asc limit 1