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A 78 year old woman presents to clinic for a check up after moving to an assisted living facility 3 weeks ago. Her daughter brought her and is concerned because she is forgetting where her new apartment is, despite not having memory problems before. The patient says that “she doesn’t like it there” and feels like she was forced to move there after her husband died earlier in the year. She answers most questions with “I don’t know.” Information from the facility indicates she is not sleeping well at night and is not eating much at meal times, and spends most of her time in her room. Mental status exam is significant for orientation to person and situation but not place or time, paucity of thought content, and poor recall at both 1 and 5 minutes. What is the most likely diagnosis?