when was first time patient 10855 was measured with a less arterial bp [diastolic] than 37.0 since 10/01/2105?
select chartevents.charttime from chartevents where chartevents.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 chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'arterial bp [diastolic]' and d_items.linksto = 'chartevents' ) and chartevents.valuenum < 37.0 and strftime('%y-%m-%d',chartevents.charttime) >= '2105-10-01' order by chartevents.charttime asc limit 1