Which complication or association is classically linked with Crohn disease?

Answer and explanation

Correct answer: B. Fistula formation

  1. Step 1: Fistula formation is classically linked with Crohn disease.
Answer
Fistula formation.
Why not the others: 'Haemolytic uraemic syndrome': it follows E. coli diarrhoea in children. 'Primary biliary cholangitis': it is an autoimmune liver disease. 'Carcinoid syndrome': it follows a neuroendocrine tumour.

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