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: Consider Input: Question: Which of the following molecules has a simple covalent bond? 
 Options:  <1> C2. <2> N 2 <3> O 2 <4> O 3. <5> F 2

Output: 5


Input: Consider Input: Question: The main indication for using 4 drugs in the initial treatment of tuberculosis is: 
 Options:  <1> Affectation of the central nervous system. <2> High prevalence of primary resistance to isoniazid. <3> Cavitated and extensive pulmonary tuberculosis with large bacillary load. <4> Disseminated tuberculosis associated with HIV infection. <5> Extrapulmonary tuberculosis in immunodepressed patients of any origin.

Output: 2


Input: Consider Input: Question: In the absence of oxygen, the mitochondrial citric acid cycle is inhibited because: 
 Options:  <1> Increases the concentration of ADP, an inhibitor of isocitrate dehydrogenase. <2> The phosphorylations at the substrate level can not be produced. <3> No pyruvate available. <4> ATP synthase is inhibited. <5> The necessary coenzymes can not be reoxidized.


Output: 5