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
Renal calculus is seen in massive bowel resection due to - 
Select and explain. 
A. Reduced renal calcium excretion, B. More calcium absorption in gut, C. More oxalate absorption in gut, D. None of the above
C: More oxalate absorption in gut
Answer: C: More oxalate absorption in gut 
Explanation: None