A 74-year-old man is brought to his general practitioner by his daughter, who is worried about his memory over the past three months. He has stopped attending his lawn bowls club, has lost 6 kg, and wakes at 4 am most mornings unable to return to sleep. His difficulties began soon after his wife died, and he tells the doctor he is 'useless' and a burden to his family. During cognitive testing he frequently answers 'I don't know' and gives up quickly, but with encouragement he recalls recent family events accurately. Which one of the following is the most likely diagnosis?
Keep going — a set of ten like this one, one at a time.
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