This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small intestine, Subject name: Surgery
[{'content': 'Fistula leading to highest electrolyte imbalance is: \nSelect and explain. \nA. Gastric, B. Duodenal, C. Sigmoid, D. Rectal', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In general, the more proximal the fistula in the intestine, the more serious the problem, with greater fluid and electrolyte loss. The drainage has a greater digestive capacity, and the distal segment is not available for absorption of nutrients. Fistula leading to highest electrolyte imbalance is Duodenal fistula', 'role': 'assistant'}]