The correct option is C Polycythemia
Anemia or anaemia is usually defined as a decrease in a number of red blood cells (RBCs) or hemoglobin in the blood. Polycythemia is a condition that results in an increased level of circulating red blood cells in the bloodstream. Pneumonia is a lung infection causing cough, fever and breathing problems. Leukemia is a group of cancers that usually begin in the bone marrow and result in high numbers of abnormal white blood cells. Therefore, the correct answer is option D.