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': 'CO2 diffuses more easily through the respiratory membrane than O2 because it is- \nSelect and explain. \nA. Less dense, B. More soluble in plasma, C. Less molecular weight, D. Less PCO2 in the alveoli', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) More soluble in plasma(Ref: Ganong, 25th ed/p.639)The diffusion coefficient of CO2 is about 20 times that of O2 . So, CO2 diffuses much faster and easily than O2', 'role': 'assistant'}]