question: Q:A 29-year-old man is brought to the emergency department by his wife due to unusual behavior for the past week. She has noted several incidents when he spoke to her so fast that she could not understand what he was saying. She also says that one evening, he drove home naked after a night where he said he was ‘painting the town red’. She also says he has also been sleeping for about 2 hours a night and has barely had any sleep in the past 2 weeks. She says that he goes ‘to work’ in the morning every day, but she suspects that he has been doing other things. She denies any knowledge of similar symptoms in the past. On physical examination, the patient appears agitated and is pacing the exam room. He compliments the cleanliness of the floors, recommends the hospital change to the metric system, and asks if anyone else can hear ‘that ringing’. Laboratory results are unremarkable. The patient denies any suicidal or homicidal ideations. Which of the following is the most likely diagnosis in this patient?? 
  {'A': 'Major depressive disorder', 'B': 'Brief psychotic disorder', 'C': 'Schizoaffective disorder', 'D': 'Bipolar disorder, type I', 'E': 'Bipolar disorder, type II'},