tell me the total of the thoracentesis output of patient 85895.
select sum(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 85895 ) ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'thoracentesis' and d_items.linksto = 'outputevents' )