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': 'Increase in number of RBC is seen in \nSelect and explain. \nA. Neutropenia, B. Leukemia, C. Polycythemia, D. Anaemia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]