This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': 'Type of renal stone formed in a patient with regional enteritis \nSelect and explain. \nA. Calcium oxalate, B. Cysteine, C. Struvite, D. Urate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Calcium oxalate* Calcium oxalate kidney stones are most common in CD.* Cholesterol type gallstones are also most common in CD.', 'role': 'assistant'}]