Kate has been having a low mood almost every day for the past three years. She has never experienced a manic episode and doesn't use any drugs. She feels exhausted all the time, barely eats, and keeps waking up in the middle of the night. She has CSD in SOOF (clinically significant distress in social, occupational or other areas of functioning). What does Kate have?
A. Persistent Depressive Disorder B. Dysthymia C. A and B because they are different names for the same disorder D. Premenstrual dysphoric disorder