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: Statins are used to reduce cholesterol levels and act as analogs of the transition state of an enzyme involved in its biosynthesis. What enzyme is it? 
 Options:  <1> 14-Alpha-demethylase. <2> Hydroxymethylglutaryl coenzyme A (HMGCoA) reductase. <3> Cyclooxygenase 2 (COX-2). <4> Squalene epoxidase. <5> Aromatase
[A]: 2


[Q]: Question: The tissue is avascular: 
 Options:  <1> Epithelial. <2> Conjunctive. <3> Osseous. <4> Muscular. <5> Nervous.
[A]: 1


[Q]: Question: The stabilizing effect of the alkyl groups on the adjacent π bonds is explained in terms of: 
 Options:  <1> Isomería. <2> Mesomería. <3> Inductive effect <4> Hyperconjugation. <5> Stereoisomería.
[A]:
4