<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 64-year-old man is admitted with a history of altered mental status. He was in his usual state of health until a few days ago when he has started to become confused, lethargic, forgetful, and repeating the same questions. Over the last few days, he sometimes appears perfectly normal, and, at other times, he has difficulty recognizing his family members. Yesterday, he was screaming that the room was filled with snakes. Past medical history is significant for type 2 diabetes mellitus, managed medically, and chronic kidney disease, for which he undergoes regular hemodialysis on alternate days. There is no history of smoking, alcohol use, or illicit drug use. His vitals include: blood pressure 12988 mm Hg, pulse 112min, temperature 38.2C 100.8F, and respiratory rate 20min. The patient is oriented only to person and place. His mini-mental state examination MMSE score is 1830, where he had difficulty performing basic arithmetic calculations and recalled only 1 out of 3 objects. Nuchal rigidity is absent. Muscle strength is 55 bilaterally. Which of the following is the most likely diagnosis in this patient?? A: Delirium, B: Dementia, C: Schizophrenia, D: Transient global amnesia, E: Wernickes aphasia,  <response>: This is a clinical vignette describing a 64-year-old man with recent onset of confusion, lethargy, forgetfulness, repeating questions, and hallucinations. He has a history of diabetes and chronic kidney disease. On exam, he is disoriented, has impaired cognition on MMSE, but no focal neurological deficits. The acute onset of symptoms in a previously normal individual points to delirium as the most likely diagnosis. Dementia is a more chronic and progressive disorder. Schizophrenia and Wernickes aphasia do not fit the clinical picture. Transient global amnesia can cause acute confusion but is not associated with the other symptoms described.A: Delirium 