A 74-year-old gentleman presents to his general practitioner (GP) with worsening fatigue
A 74-year-old gentleman presents to his general practitioner (GP) with worsening fatigue, some changes to his bowel habits and intermittent blood in his stools. He also reports some discomfort of his tongue as well as the nail changes shown below.

What is the most likely cause of his symptoms?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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