Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Point out the correct statement: 
 Options:  <1> At low pO2, myoglobin is more saturated with O2 than hemoglobin. <2> CO2 increases the affinity of hemoglobin for O2. <3> 2,3 Bisphosphoglycerate is strongly bound in oxygenated hemoglobin. <4> The tissues that produce lactate release more O 2. <5> At high pO2, hemoglobin has 2 subunits.
