<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 14-year-old girl is presented by her mother who says she has trouble focusing. The patients mother says that, over the past 2 months, the patient has lost interest in her normal activities and has become more withdrawn. She no longer participates in activities she enjoys and says that she has contemplated suicide. The patients mother says that, at other times, she is hyperactive and cant ever seem to be still. Before the onset of her depression, she had an 8 day period where she did not sleep and was constantly on the go. She was so energetic at school that she was suspended for a month. The patient is afebrile and vitals are within normal limits. Physical examination is unremarkable. Routine laboratory tests and a noncontrast computed tomography CT of the head are normal. Which of the following would be the best course of treatment in this patient?? A: Chlorpromazine, B: Lithium, C: Ramelteon, D: Phenobarbital, E: Amitriptyline,  <response>: This is a clinical case of a 14-year-old girl presenting with symptoms of depression, suicidal ideation, periods of hyperactivity and decreased need for sleep. She was previously suspended from school for hyperactive behavior. Her physical exam and head CT were normal. The key findings here are the depressive symptoms, periods of hyperactivitydecreased need for sleep, and onset during adolescence. This clinical picture is most consistent with bipolar disorder. Lithium is a mood stabilizer and first-line treatment for bipolar disorder. The other options provided are not appropriate first-line treatments.B: Lithium 