Task: Question Answering
Input (English): Question: Hypoxemic hypoxia occurs when: 
 Options:  <1> Oxygen diffusion of lungs is difficult. <2> There is decreased blood flow due to cardiogenic shock. <3> The decrease in hemoglobin due to anemia prevents its transport. <4> The cell membrane is altered and can not use oxygen. <5> None is correct.
Output (English): 1