This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 2, Subject name: Physiology
A patient with carbon monoxide poisoning is treated with hyperbaric oxygen that increases the aerial PO2 to 2000 mm Hg. The amount of oxygen dissolved in the aerial blood (in ml/100 ml) is: 
Select and explain. 
A. 2, B. 3, C. 4, D. 6
D: 6
Answer: D: 6 
Explanation: Since the solubility of oxygen is 0.003 ml O2/100 ml blood, an aerial PO2 of 2000 mm Hg will increase the concentration of the dissolved oxygen to 6 ml O2/100 ml blood. Note that this actually exceeds the normal aerial-venous difference for the oxygen concentration.