when did patient 51177 receive a test for cholesterol, total for the last time since 02/2103?
select labevents.charttime from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'cholesterol, total' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 51177 ) and strftime('%y-%m',labevents.charttime) >= '2103-02' order by labevents.charttime desc limit 1