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: The Aminoacyl-tRNAs: 
 Options:  <1> They are the precursors of the RANs. <2> They are enzymes that catalyze the synthesis of amino acids. <3> They are part of the ribosomes. <4> They are the tRNAs loaded with the amino acid specified by its anticodon sequence. <5> They are synthesized by RNA Polymerase II.

Ex Output:
4


Ex Input:
Question: The negative symptomatology of schizophrenia seems to be caused by: 
 Options:  <1> The excessive activity of some dopaminergic neural circuits. <2> The excessive activity of the GABAergic neurons. <3> The existence of brain damage. <4> Have a gene for schizophrenia that causes negative symptoms. <5> Insufficient activity of the serotonergic neurons of the frontal lobe.

Ex Output:
3


Ex Input:
Question: The chemosmotic theory: 
 Options:  <1> It was proposed by Singer and Nicholson. <2> Explains the mechanism of phosphorylation at the substrate level. <3> It requires that the membranes in which it forms are closed compartments. <4> It does not explain the synthesis of ATP in photosynthesis. <5> It has nothing to do with redox reactions.

Ex Output:

3