Answer- C. Internal carotid aerySurgical ligation of vessels or embolization is the last reso to control epistaxis when all other methods fail. Internal carotid aery is not ligated in case of epistaxis control, as it is the msinvessel supplying the central nervous system."Endoscopy identifies the source of posterior epistaxis in over 80 percent of the cases. Ligation should be performed as close as possible to the likely bleeding point. Thus the hierarchy of ligation is: Sphenopalatine aery; internal maxillary aery; external carotid aery; anterior/posterior ethmoidal aery.