This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
[{'content': 'Fistula leading to the highest electrolyte imbalance is? \nSelect and explain. \nA. Gastric, B. Duodenal, C. Sigmoid, D. Rectal', 'role': 'user'}, {'content': "Answer: A \nExplanation: Gastric REP: Sabiston 17' ed p. 324, CSDT 11th ed p. 696 Enterocutaneous fistula: Most common: iatrogenic High output > 500 ml/d The more proximal the fistula, more severe are complications. Complications: fluid and electrolytes, malnutrition, necrosis of skin, sepsis leading to multi organ failure and death.", 'role': 'assistant'}]