This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Physiology
[{'content': 'Cyanosis does not occur in severe anemia because - \nSelect and explain. \nA. Hypoxia stimulates erythropoietin production, B. Oxygen carrying capacity of available Hb is increased, C. Critical concentration of Hb required to produce Cyanosis is reduced, D. Oxygen hemoglobin curve shift to the right', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Critical concentration of Hb required to produce Cyanosis is reduced(Ref: Ganongy 25th ed/p.646)Cyanosis is not seen in anemic hypoxia because critical concentration of Hb required to produce cyanosis is reduced', 'role': 'assistant'}]