This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Which is not seen in polycythemia vera \nSelect and explain. \nA. Increased Vit B12 binding capacity, B. Increased erythropoietin level, C. Increase RBC count, D. Ocular congestion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Harshmohan textbook of pathology 7th edition. *in PV unlike secondary polycythemia erythropoetin level in urine and serum is reduced.', 'role': 'assistant'}]