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: Physiology
[{'content': 'Abnormal increase in the number of RBCs is known as: \nSelect and explain. \nA. Leukocytosis, B. Polycythemia, C. Anaemia, D. Thrombocytosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Abnormal increase in the number of RBC is known as Polycythemia.\nIn severe polycythemia (excessive production of red blood cells), the increase in resistance does increase the work of the heart.\xa0\nReference: Ganong’s Review of Medical Physiology T W E N T Y - F I F T H\xa0 \xa0E D I T I O N page no 574', 'role': 'assistant'}]