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: Surgery
[{'content': 'After ureterosigmoidostomy which electrolyte abnormality may occur \nSelect and explain. \nA. Hyperkalemic alkalosis, B. Metabolic alkalosis, C. Metabolic acidosis, D. Hypokalemic acidosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]