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'.

Example Input: Question: In the respiratory chain: 
 Options:  <1> Ferrosulfurized proteins contain heme groups. <2> The heme groups are in carotenoids. <3> Cytochromes contain iron and sulfur groups. <4> Ubiquinones transport protons and electrons. <5> All transporters carry two electrons.
Example Output: 4

Example Input: Question: Separations by capillary zone electropheresis (CZE) are characterized in that the electrophoretic medium: 
 Options:  <1> It is always formed by 1.0 M HCl. <2> It is always formed by NH3 1.0 M. <3> It is homogeneous throughout the capillary. <4> It is not homogeneous throughout the capillary. <5> It has a pH gradient throughout the entire capillary.
Example Output: 3

Example Input: Question: The triple point of a phase diagram of a component: 
 Options:  <1> Presents 3 degrees of freedom, according to the rule of the phases. <2> Presents 1 degree of freedom, according to the rule of the phases. <3> It is characterized because the liquid and gas phases are indistinguishable. <4> It is characterized because there are three phases in equilibrium. <5> It is characterized because there are four phases in equilibrium.
Example Output:
4