Question: A 53-year-old man presents to the emergency department with complaint of sore throat progressively worsening for 3 days with intermittent fever. In triage he tells the RN that he has taken ibuprofen 400 mg 4 hours ago for the pain, and currently his vital signs are blood pressure 120/80, heart rate 88, respiratory rate 12, SPO2 96% on room air. While waiting for the results of the rapid strep test the patient becomes agitated, restless, confused, and increasingly difficult to redirect. He is transferred to the psychiatric emergency department because it is a locked unit. Which of the following is the most likely diagnosis? A. Presenile dementia B. Personality disorder C. Mixed delirium D. Mood disorder