The Patient Has Been in the Hospital for Several Days

The patient has been in the hospital for several days for urosepsis.He has been responding favorably to treatment,and his vital signs have been "normal" for 2 days.When the nurse takes his vital signs,however,the patient's apical pulse is 152 and regular.The nurse suspects that:

A) He is having a reaction to his narcotic medication
B) He may be suffering from hypothermia
C) His fever may have returned
D) The patient may be an athlete