This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'What is not true about polycythemia vera \nSelect and explain. \nA. It is a cancerous conditoon, B. Incraese in rbc count, C. Blood viscosity increases, D. Decrease in pcv', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Polycythemia doest cause decrease in pcv', 'role': 'assistant'}]