uk-dgm MCQ (SBA): Alzheimer's Disease Diagnosis

A 77-year-old woman presents to her GP with a 6-month history of progressive memory loss and word-finding difficulties. Her husband reports she has become increasingly apathetic and socially withdrawn. She has no hallucinations, her gait is normal, and she has no Parkinsonian features. MoCA score is 19/30 with particular difficulty in delayed recall and orientation. MRI brain shows bilateral hippocampal atrophy. What is the MOST likely diagnosis?