A 78-year-old man presents for a follow-up visit. Two months ago he was started on sertraline  for major depressive disorder and has been titrated up to 100 mg daily. Today his daughter reports that she cannot really evaluate if his mood has improved because he seems to have become confused. The patient’s daughter reports a distinct new onset confusion and forgetfulness. 

The PMHNP considers the most likely cause of his confusion to be: 

A. Urinary tract infection. 

B. Hyponatremia

C. Alzheimer’s disease 

D. Depression 

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YouTube: https://www.youtube.com/watch?v=HGxzaaVSVxk&list=PLf0PFEPBXfq5HGfNV-GbOlYHtDwd35OeG&index=95