The correct answer is: Both A and B.
Antigens are molecules that can trigger
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Plasma is the liquid part of blood. It contains water, proteins, electrolytes, and other substances. Plasma helps to transport nutrients and waste products throughout the body.
WBCs are a type of blood cell that helps to fight infection. They are produced in the bone marrow. There are many different types of WBCs, each with a different function.
Antigens can be proteins, carbohydrates, or lipids. They can be found on the surface of cells, or they can be free-floating in the blood. When an antigen enters the body, it can trigger an immune response. The immune system will produce antibodies that bind to the antigen. This binding can help to destroy the antigen, or it can help to mark the antigen for destruction by other immune cells.
Antigens are important in the immune system. They help the body to recognize and fight off infection.