This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
Megaloblastic anemia In blind loop syndrome Is due to - 
Select and explain. 
A. Vitamen Bla malabsorption, B. Bacterial overgrowth, C. Frequent diarrhoea, D. Decrease iron intake
B: Bacterial overgrowth
Answer: B: Bacterial overgrowth 
Explanation: <p>In blind loop syndrome, chronic diarrhoea & malabsorption occur because of bacterial overgrowth & recurrent gastrointestinal infections .The patient presents with watery diarrhoea & anemia due to B12 deficiency .It is because of bacterial overutilisation of vitamin B12.</p><p>Reference :Davidson&;s principle & practice of medicine 22nd edition pg no 883.</p>