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': 'Renal calculus is seen in massive bowel resection due to - \nSelect and explain. \nA. Reduced renal calcium excretion, B. More calcium absorption in gut, C. More oxalate absorption in gut, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]