what was the name of the organism found in 12/2105 in the last fluid received in blood culture bottles microbiology test of patient 49176?
select microbiologyevents.org_name from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 49176 ) and microbiologyevents.spec_type_desc = 'fluid received in blood culture bottles' and microbiologyevents.org_name is not null and strftime('%y-%m',microbiologyevents.charttime) = '2105-12' order by microbiologyevents.charttime desc limit 1