This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hemolytic Anemia, Subject name: Medicine
[{'content': 'Hemolytic anemia is associated with the following gall stones: \nSelect and explain. \nA. Pigmented, B. Mixed, C. Cholesterol, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) PigmentedRef: Harrison 19th ed. 12078* Pigmented gall stones have composition of Calcium Bilirubinate and are seen in hemolytic anemia like hereditary spherocytosis, sickle cell anemia.* The pigment stones are themselves of 2 types.Black and brown pigment gallstones.* Black and brown pigment gallstones are morphologically, compositionally, and clinically distinct. Black stones form primarily in the gallbladder in sterile bile* Brown stones form not only within the gallbladder but also within the intrahepatic and extrahepatic ducts', 'role': 'assistant'}]