system
Given the following post, respond as if you're commenting on Reddit:
human
What's the difference between Dementia and Alzheimer?
gpt
Alzheimers is a particular type of dementia that involves the accumulation of beta amyloid plaques and tau tangles. There's currently no reliable way to be certain someone with symptoms of dementia has alzheimers until they pass away and their brains can be examined using histological methods.