In the context of a workshop on rheumatoid arthritis, a clinical educator is teaching a group of ...

In the context of a workshop on rheumatoid arthritis, a clinical educator is teaching a group of nurses about autoimmune diseases. Which of the following statements by an attendee would the educator most likely want to follow up with further teaching?
 
  A)
  Introduction of a foreign antigen can sometimes induce a cascade of immune response that is not self-limiting
  B)
  Often the problem can be traced to antigens that sensitize T cells without the need for presentation.
  C)
  In some cases, the body attacks its own cells that are chemically similar to those of infectious organisms.
  D)
  Sometimes when the body's own cells are released after a long time, they are interpreted as being foreign.