The Patient Tells the Nurse, "I Thought I Was Just

The patient tells the nurse, "I thought I was just depressed, but my doctor says I have bipolar disorder. What is that?" What is the best response by the nurse?

A) "Bipolar disorder is just another type of depression, except your depression occurs in cycles."
B) "Bipolar disorder is a type of depression that includes attention deficit disorder symptoms."
C) "Bipolar disorder just means that your mood alternates with the seasons, and it becomes worse in the winter."
D) "Bipolar disorder means you have cycles of depression as well as hyperactivity, or mania."