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
Central cyanosis not occurs when total Hb and reduced Hb level is respectively (in gmdeg/o): 
Select and explain. 
A. 10.9 & 4.1, B. 10.9 & 5.110.9 & 6.1, C. 8.9 & 4.1, D. All
A: 10.9 & 4.1
Answer: A: 10.9 & 4.1 
Explanation: A i.e. 10.9 & 4.1