tell me the name of the last specimen test patient 26612 had received in 12/2102?
select microbiologyevents.spec_type_desc from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 26612 ) and strftime('%y-%m',microbiologyevents.charttime) = '2102-12' order by microbiologyevents.charttime desc limit 1