You are a clinician working at a local family practice clinic. Karen, a 34-year-old woman, has visited the clinic 3 times in the past 3 months with a variety of complaints. After researching her symptoms online, Karen has come to the conclusion that she is suffering from an autoimmune disease. As you take Karen's recent health history, she makes several comments about what she has read online. Which of the following statements from Karen about autoimmune diseases is true? A. "Certain autoimmune diseases, like rheumatoid arthritis, are more common in women."
B. "Autoimmune diseases are genetic. They just appear out of nowhere and for no apparent reason."
C. "Autoimmune diseases affect only one organ in the body at a time, and it is usually the lungs."
D. "There are no diagnostic tests available for autoimmune diseases."