A 24 year old nursing student was having difficulty keeping up in class because of extreme fatigue.She sought help from the Students' Health Service.A full blood count (FBC) showed anaemia with increased RBC (red blood cell) size (macrocytic anaemia) .An upper GI endoscopy was performed,and biopsies taken.A representative section of the biopsy is shown in the accompanying photomicrograph,with normal small bowel shown on the left for comparison (villi are identified as "V") .Which one of the following is the best diagnosis? 
Definitions:
European Banking
European Banking refers to the banking system and practices within Europe, characterized by diverse regulations and markets across different European countries.
Newlands Reclamation Act
A 1902 U.S. law that funded irrigation projects for the arid lands of 20 states in the American West, aiming to encourage agriculture through water management.
Riparian Rights
Legal entitlements of landowners to access and use water from a river, stream, or other watercourse flowing adjacent to their land.
Conservation Movement
A social and political effort aimed at preserving, protecting, and restoring the natural environment from degradation and exploitation.
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