The right option is; innate
The innate immune system is an immunity system in which the defenses against pathogens is always general and is being activated the same way. The innate immune system is composed of barriers that help to keep pathogens (such as bacteria) and other foreign particles out of the body or prevent their spread within the body. Physical barriers (such as skin, the respiratory tract), defense mechanisms (such as secretions, bile) and general immune responses (such as inflammation) are all part of the innate immune system.
