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': 'Following are seen in polycythemia vera except: September 2011 \nSelect and explain. \nA. Most common cause of polycythemia, B. Increased erythropoietin, C. Erythropoietin independent growth of red cell progenitors, D. Intrinsic abnormality of hematopoietic precursors', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Increased erythropoietin The combination of iron deficiency anemia, glossitis and esophageal dysphagia usually related to the webs is known as the Plummer Vinson syndrome or Paterson Kelly syndrome. Plummer-Vinson syndrome/PVS/Paterson-Brown-Kelly syndrome/sideropenic dysphagia It presents as a triad of dysphagia (due to esophageal webs), glossitis, and iron deficiency anemia. In primary polycythemia, there may be 8 to 9 million and occasionally 11 million erythrocytes per cubic millimeter of blood (a normal range for adults is 4-6), and the hematocrit may be as high as 70 to 80%. In addition, the total blood volume sometimes increases to as much as twice normal.', 'role': 'assistant'}]