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'.

Ex Input:
Question: Ferrous oxide, known as wustite (FeO) is non-stoichiometric because it contains: 
 Options:  <1> Excess iron <2> Oxygen excess <3> Iron defect. <4> Oxygen defect. <5> Defect of iron and oxygen.

Ex Output:
3


Ex Input:
Question: The cellulose acetate filter membranes are compatible with: 
 Options:  <1> Organic solvents. <2> Aqueous solutions <3> All solvents <4> Organic solvents, except nitrogen. <5> Nitrogen solvents.

Ex Output:
2


Ex Input:
Question: The rhythmic movements like walking or running are: 
 Options:  <1> Reflex movements. <2> Voluntary movements <3> Initiated and terminated by the cerebral cortex. <4> A combination of reflex and voluntary movements. <5> 3 and 4 are correct.

Ex Output:

5