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: Anatomy
[{'content': 'Right isomerism is? \nSelect and explain. \nA. Asplenia, B. Two spleens, C. One spleen, D. Polysplenia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]