In fever, the temperature of the body increases which helps immune cells fight the infectious pathogens which are the cause of fever. So the correct option is A.
The process of maintaining a normal and healthy range for various factors of our body is called homeostasis. In case of any deviation from the normal condition, the immune system helps by fighting pathogens.
When a pathogen causes an infection, the immune system will respond by raising the temperature of the body which manifests as fever. This causes an increase in blood flow which brings the immune cells and oxygen to the site of infection.
The rise in temperature also resists the movement of pathogens from the site of infection.
The rise in temperature of the body due to infection is because of the release of pyrogens. These are substances released by the pathogens and they alert the brain about the energy of a foreign substance. This is when the brain responds to it by increasing the temperature of the body.
Therefore, the correct option is A.
Read more about homeostasis, here
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