This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallstone Disease, Subject name: Surgery
[{'content': 'In Hemolytic anemia which stones are commonly seen : \nSelect and explain. \nA. Pigment stone, B. Cholesterol stone, C. Mixed stone, D. All of above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Pigment stonesRef: Bailey & Love 26th ed. /1106-1107In hemolytic anemia like hereditary spherocytosis, on account of increased extravascular hemolysis, there is production of calcium bilirubinate stones (pigment stones).', 'role': 'assistant'}]