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': 'All of the following are seen in polycythemia rubra vera except - \nSelect and explain. \nA. Increased Vit B12, binding capacity (>9000 micromols/dL), B. Decreased LAP score, C. Leucocytosis, D. Increased platelets', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]