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 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
[EX A]: 2

[EX Q]: Question: In the health report of Mrs. P. T. of 83 years of age, it is reported that she has a depressive picture. Regarding depression in the elderly has been described that:
Options: <1> It is uncommon for them to have somatic symptoms. <2> It is not characteristic that cognitive disorders appear. <3> The Yesavage scale is an instrument to establish a safe diagnosis of depression. <4> There is unanimity in stating that it has specific manifestations in the elderly. <5> There may be pictures of pseudodementia, with symptoms of dementia but caused by depressive states.
[EX A]: 5

[EX Q]: Question: Organomagnesium compounds are commonly referred to as:
Options: <1> Lipshutz <2> Birch. <3> Grignard. <4> Noyori <5> Blanc.
[EX A]:
3