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: Generates hydrogen peroxide in the phagosome: 
 Options:  <1> Myeloperoxidase <2> Carbonic anhydrase. <3> NADPH oxidase. <4> Cytochrome C oxidase. <5> Superoxide dismutase.

Ex Output:
5


Ex Input:
Question: The reaction of Wolff-Kishner is one: 
 Options:  <1> Oxidation of carbonyls to give acids. <2> Reduction of carbonyls to alcohols. <3> Deoxygenation of carbonyls that takes place in an acid medium. <4> Deoxygenation of carbonyls that is carried out in an alkaline medium. <5> Carbonyl deoxygenation performed in neutral medium.

Ex Output:
4


Ex Input:
Question: If the arterial pO2 decreases to 60 mm of Hg: 
 Options:  <1> Decreases ventilation. <2> Central chemoreceptors are activated. <3> The central chemoreceptors are depressed. <4> The arterial chemoreceptors are activated. <5> It produces loss of consciousness.

Ex Output:

4