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
In presence of Halden effect, CO2 uptake is 2 ml/ 100 ml of blood in aeries, what will be CO2 uptake in absence of Haldone effect in veins ? 
Select and explain. 
A. 2 ml/100 ml of blood, B. 4 ml/100 ml of blood, C. 6 ml/100 ml of blood, D. 8 ml/100 ml of blood
B: 4 ml/100 ml of blood
Answer: B: 4 ml/100 ml of blood 
Explanation: Ans. is 'b' i.e., 4 ml/100 ml of blood