A 64 year-old man has a past medical history of two strokes and diabetes. his dementia started four weeks after his first stroke and got worse after in his next stroke. he is most likely afflicted with:

The answer would be vascular dementia

There are several causes of dementia, one of them is vascular. Vascular dementia happens because of damage to the blood vessels that cause reduced oxygen and nutrient to the brain. The cause could be hypertension, diabetes, or stroke. The patient in this problem has dementia that got worse after stroke, so it is more likely to be vascular dementia.