<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 79-year-old woman who lives alone is brought to the emergency department by her neighbor because of worsening confusion over the last 2 days. Due to her level of confusion, she is unable to answer questions appropriately. She has had type 2 diabetes mellitus for 29 years for which she takes metformin. Vital signs include: blood pressure 11172 mm Hg, temperature 38.5C 101.3F, and pulse 100min. Her fingerstick blood glucose is 210 mgdL. On physical examination, she is not oriented to time or place and mistakes the nursing assistant for her cousin. Laboratory results are shown:Hemoglobin 13 gdLLeukocyte count 16,000mm3Segmented neutrophils 70Eosinophils 1Basophils 0.3Lymphocytes 25Monocytes 4Which of the following is the most likely diagnosis?? A: Alzheimers dementia, B: Depression, C: Brief psychotic disorder, D: Delirium, E: Delusional disorder,  <response>: This is a clinical vignette describing a 79-year-old woman with worsening confusion over the past 2 days. Key findings include:- Lives alone, brought to ED by neighbor due to confusion- Unable to answer questions appropriately due to confusion- Longstanding type 2 diabetes 29 years on metformin- Fever of 38.5C, tachycardia - Hyperglycemia glucose 210 mgdL- Disoriented to time and place, mistaking nursing assistant for cousin- Leukocytosis with left shiftBased on the acute onset of confusion in an elderly patient with fever, tachycardia, and leukocytosis, the most likely diagnosis is delirium. The other choices can be ruled out:- Alzheimers dementia has insidious onset.- Depression would not cause disorientation. - Brief psychotic disorder is possible but less likely than delirium given the fever and leukocytosis.- Delusional disorder has subacute onset over weeks to months.D: Delirium 