Which type of cells are primarily responsible for immune response in the body?

The correct answer is basophils, as these cells play a crucial role in the body's immune response. Basophils are a type of white blood cell that are part of the immune system. They contribute by releasing substances such as histamine during allergic reactions and inflammation, which helps to increase blood flow to areas of infection and recruit other immune cells to the site of injury or pathogens. Their involvement in the inflammatory response is vital for protecting the body against infections and responding to allergens.

Other options, while important in their respective functions, do not primarily serve the immune response in the same way. Adipocytes are fat cells that store energy and don't play a direct role in immunity. Neurons are nerve cells responsible for transmitting signals in the nervous system, and keratinocytes are the predominant cells in the outer layer of the skin, primarily serving a protective function rather than a direct role in immune responses.