Which condition results from niacin deficiency in adults?

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Memory loss and cognitive declineFrequent loose stoolsPainful sores on the tongue and inside the mouthAll of the above symptomsNone of the above

Explanation

Niacin deficiency in adults leads to a group of symptoms including dementia (memory and cognitive issues), diarrhea, and ulcerated sores in the mouth and on the tongue. Therefore, all these manifestations collectively indicate niacin deficiency.