Background Paragraph: The Fink effect, also known as "diffusion anoxia",[1] "diffusion hypoxia",[2] or the "third gas effect",[3] is a factor that influences the pO2 (partial pressure of oxygen) within the alveolus. When water-insoluble gases such as anesthetic agent N2O (nitrous oxide) are breathed in large quantities they can be dissolved in body fluids rapidly. This leads to a temporary increase in both the concentrations and partial pressures of oxygen and carbon dioxide in the alveolus. 
Story: An accident occurred in a local chemical factory. Consequently, large amount of various gases been released to the atmosphere. Local hospital is evaluating all the patients who have been affected by this accident. John, a doctor at the hospital, is seeing two patients, patient A and patient B. He concluded that patient A was having Fink effect. But he didn't see any sign of Fink effect in patient B.
Which patient would have breathed large quantities of water-insoluble gases, patien A or patient B? Which patient would have breathed normal quantities of water-insoluble gases, patien A or patient B? Which patient would have increased partial pressure of oxygen in the alveolus? Which patient would have normal partial pressure of oxygen in the alveolus? Which patient's alveolus would have high concentrations of oxygen and carbon dioxide, patient A or patient B? Which patient's alveolus would have normal concentrations of oxygen and carbon dioxide, patient A or patient B? Would patient A have breathed large quantities or normal quantities of water-soluble gases? Would patient A have increased or normal partial pressure of oxygen in the alveolus? Would patient B have breathed large quantities or normal quantities of water-soluble gases? Would patient B have increased or normal partial pressure of oxygen in the alveolus?