Masayo Nishii is an international student from Japan who has come to study engineering in Melbourne. She is in her final year of the course and has been living by herself while she studying for the last 3 years. She has been to see two different psychologists about her occasional low mood, decreased need for sleep and irritability. She would also experience periods of extreme risk taking and alcohol use in what were described by her friends as hypomanic episodes. These episodes would usually last for a few days and would occur every 3 months or so. During this time Masayo is unable to engage in her uni work and has significant interpersonal difficulties. Her first psychologist, who she was seeing when living in Japan, diagnosed Masayo with major depression and then borderline personality disorder in an attempt to address her symptoms. The psychologist in Melbourne instead thought the symptoms were symptomatic of bipolar disorder. Based on the information in the case study, Masayo could be diagnosed with:
a. Bipolar II – because of the hypomanic episodes
b. Bipolar I – because of the symptoms of depression and mania
c. Persistent Depressive Disorder – because the symptoms have been present for 3 years
d. Major Depressive Disorder – because the symptoms have caused her significant distress