Task: Question Answering
Input (English): Question: Indicate which of the following statements about dead space of the airway is correct: 
 Options:  <1> It is the air that occupies the airway and is used in the exchange of gases. <2> In an adult person it is about 3250 ml. <3> In each respiratory cycle the air from the dead space is poor in O2. <4> It is the lung area that is not ventilated and therefore does not contain gases. <5> It includes airways and alveoli that do not participate in the exchange of gas with blood.
Output (English): 5