<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 21-year-old female is brought to the emergency department by her roommate. Her roommate says that the patient has been acting strangely for the past 10 days. She has noticed that the patient has been moving and talking on the phone at all hours of the night. She doesnt think that the patient sleeps more than one to two hours a night. She also spends hours pacing up and down the apartment, talking about trying to save the world. She also notices that the patient has been speaking very fast. When asking the patient if anything seems different, the patient denies anything wrong, only adding that, shes made great progress on her plans. The patient said she has felt like this on one occasion 2 years ago, and she recalled being hospitalized for about 2 weeks. She denies any history of depression, although she said about a year ago she had no energy and had a hard time motivating herself to go to class and see her friends for months. She denies hearing any voices or any visual hallucinations. What is the most likely diagnosis in this patient?? A: Schizoaffective disorder, B: Major depressive disorder, C: Bipolar I disorder, D: Bipolar II disorder, E: Dysthymic disorder,  <response>: Based on the information provided in the question stem, the key findings are:- 21-year-old female with recent changes in behavior over the past 10 days- Decreased need for sleep 1-2 hours per night- Increased motor activity pacing and speech talking fast- Grandiose ideas trying to save the world - Denies anything is wrong- Prior hospitalization 2 years ago for similar symptoms - Prior episode of depression 1 year ago- No hallucinationsThis presentation is most consistent with mania, which is a hallmark of bipolar disorder. The lack of hallucinations makes schizoaffective disorder unlikely. The prior depressive episode points more towards bipolar disorder rather than unipolar depression. The patients young age also favors a diagnosis of bipolar disorder.C: Bipolar I disorder 