Final answer:
Redness is one of the characteristic, localized cardinal signs of acute inflammation, which is caused by the increased blood flow and immune response at the site of injury or infection.
Step-by-step explanation:
The characteristic, localized cardinal signs of acute inflammation include redness, swelling, heat, and pain due to the process of increased blood flow to the infected or injured tissue, along with the movement of leukocytes and fluid through the opened capillaries to the site of infection. Additionally, loss of function can sometimes occur as a fifth cardinal sign. Among the options provided, redness is a localized cardinal sign of acute inflammation, whereas fever is a systemic sign, fatigue is a general symptom that can be associated with many conditions, and a granuloma is a specific type of immune response rather than a sign of inflammation.
The characteristic, localized cardinal signs of acute inflammation include redness, swelling, heat, and pain. These signs are caused by the movement of leukocytes and fluid through opened capillaries to the site of infection or injury. Fever, on the other hand, is a system-wide sign of inflammation that raises the body temperature and stimulates the immune response.