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': 'In Policythemia vera, all the following are seen except- \nSelect and explain. \nA. Thrombocytopenia, B. Increased GI bleed, C. Thrombosis, D. Transient visual loss', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]