The Nurse Is Collecting a Cold Agglutinin Titer on a Patient

The nurse is collecting a cold agglutinin titer on a patient recently admitted for pneumonia who is not responding well to antibiotics.The patient's wife asks what the test will do.Which of the following responses by the nurse is best?

A) "The test will help determine why your husband's fever is staying so high."
B) "The test helps identify your husband's resistance to current drug therapy."
C) "The test is designed to detect proteins around the red blood cells resulting from an autoimmune process."
D) "The test is used to identify atypical pneumonias that don't respond quickly to standard antibiotic treatments."