instruction: when was patient 16572 last tested until 11/2103 for chloride, whole blood?
response: SELECT labevents.charttime FROM labevents WHERE labevents.itemid IN (SELECT d_labitems.itemid FROM d_labitems WHERE d_labitems.label = 'chloride, whole blood') AND labevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 16572) AND STRFTIME('%y-%m', labevents.charttime) <= '2103-11' ORDER BY labevents.charttime DESC LIMIT 1