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
Increase in number of RBC is seen in 
Select and explain. 
A. Neutropenia, B. Leukemia, C. Polycythemia, D. Anaemia
C: Polycythemia
Answer: C: Polycythemia 
Explanation: None