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Fever, also known as pyrexia and febrile response, is defined as having a temperature above the normal range due to an increase in the body's temperature set point.
The right option is; increased body temperature
Fever is a higher than normal body temperature of an individual (or generally, a mammal). Fever is a symptom that is usually associated with several infections. Fever can occur as a result of infections such as ear infections, cold or flu which is caused by viruses, urinary tract infection, brain injuries, sore throats and some cancers.