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
[{'content': 'Sickle cell anemia is associated with which type of RCC \nSelect and explain. \nA. Medullary, B. Papillary, C. Chromophobe, D. Colloid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Medullary ca is least common and it is associated with SCD', 'role': 'assistant'}]