Which dementia type shows early behavioral and executive dysfunction with relatively preserved memory in early stages?

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This item hinges on recognizing a dementia pattern where behavior and executive skills are affected early, while memory remains relatively intact at first. Frontotemporal dementia, especially the behavioral variant, causes early changes in personality, social conduct, disinhibition, apathy, and problems with planning and decision-making due to frontal lobe degeneration. Because the disease targets the frontal and/or temporal areas, episodic memory is not the initial hurdle, so memory can be relatively preserved in the early stages.

In contrast, Alzheimer's disease typically shows prominent early memory loss with later impairment in other cognitive domains; Lewy body dementia often features fluctuating attention, visual hallucinations, and parkinsonism with less emphasis on early behavioral disinhibition; vascular dementia tends to present with a stepwise decline and prominent executive dysfunction related to cerebrovascular disease, with memory impairment not uniquely preserved early. Therefore, the described pattern best fits frontotemporal dementia.