instruction: how many times does patient 83901 make r pleural #2 in 12/2105?
response: SELECT COUNT(*) 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 = 83901)) AND outputevents.itemid IN (SELECT d_items.itemid FROM d_items WHERE d_items.label = 'r pleural #2' AND d_items.linksto = 'outputevents') AND STRFTIME('%y-%m', outputevents.charttime) = '2105-12'