when patient 10855 had the tpn d10.0 for the first time on this month/28?
select inputevents_cv.charttime from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 10855 ) ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = 'tpn d10.0' and d_items.linksto = 'inputevents_cv' ) and datetime(inputevents_cv.charttime,'start of month') = datetime(current_time,'start of month','-0 month') and strftime('%d',inputevents_cv.charttime) = '28' order by inputevents_cv.charttime asc limit 1