<prompt> A 40 year old female underwent surgery. Postoperatively she told the anesthetist that she was aware of preoperative events. Individual intraoperative awareness is evaluated by:Cerebral pulse oximetryColour DopplerBispectral imagingEnd tidal CO2  <response>: C i.e. Bispectral imaging Intraoperative awareness and depth of anaesthesia can be evaluated by BIS bispectral indexQ 