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'.

[Q]: Question: The folded sheet β: 
 Options:  <1> It is formed by a single polypetide chain. <2> It presents a distance between adjacent amino acids of approximately 4 ångströms. <3> It is formed by the union of two or more strands by hydrogen bonds. <4> Presents the side chains of contiguous amino acids pointing to the same side. <5> They are of two types: parallel, where the chains of the β sheet go in a different direction and antiparallel, where they go in the same direction.
[A]: 3


[Q]: Question: The classical pathway of complement is activated in response to: 
 Options:  <1> Antigen-antibody complexes. <2> Direct binding of C3b to bacterial walls. <3> Microbial glycolipids. <4> Properdin <5> The C-reactive protein.
[A]: 1


[Q]: Question: The symptoms of excessive daytime sleepiness, cataplexy, sleep paralysis and hypnagogic hallucinations describe: 
 Options:  <1> Simple schizophrenia <2> Refractory insomnia. <3> Narcolepsy <4> The conversion disorder. <5> Cryptoamnesia
[A]:
3