In the ICU Setting, a Patient Transported from Surgery Following

In the ICU setting, a patient transported from surgery following open heart bypass grafting will likely have his core temperature measured by a/an

A) rectal tube inserted to prevent evacuation from bowels while recovering from anesthesia.
B) temperature probe taped behind his ear.
C) esophageal flexible thermometer monitoring aorta distention.
D) pulmonary artery catheter being used to measure cardiac output.