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': 'Which among the following is false \nSelect and explain. \nA. A, B. B, C. C, D. D', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In polycythemia vera RBC mass is high as a result of negative feedback erythropoeitin levels should be less.', 'role': 'assistant'}]