A Nurse Is Teaching a Nursing Student About a Specific

A nurse is teaching a nursing student about a specific acquired immunity system. Which statement by the student indicates a need for further teaching?

A) "Cell-mediated immunity and humoral immunity are both types of specific acquired immune responses."
B) "Each exposure to an antigen causes a faster, more intense response."
C) "Immune responses occur only after exposure to a foreign substance."
D) "The skin is a factor in specific acquired immunity."