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: Pathology
[{'content': 'Gall stones in hemolytic anaemia are - \nSelect and explain. \nA. Pigment, B. Mixed, C. Cholesterol, D. Any type', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]