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: Medicine
[{'content': 'The normal spleen weighs about: \nSelect and explain. \nA. 150 g, B. 250 g, C. 350 g, D. 450 g', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The normal spleen weighs approximately 150g(and decreases its size with age. Ref: Harisson, Edition - 18, Page - 468', 'role': 'assistant'}]