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: In the β-oxidation of odd-chain fatty acids, what is the molecule that forms with the last three carbons to enter the citric acid cycle ?: 
 Options:  <1> Propionyl-CoA. <2> Methylmalonyl-CoA. <3> Succinyl-CoA. <4> Succinate <5> Malate.
[A]: 3


[Q]: Question: A 24-year-old boy who, after 3 days of high-risk sexual contact, has numerous pustular, small, very pruritic lesions that progress to minute erosions affecting the entire glans and inner face of the prepuce. Indicate which is, among the following, the most probable diagnostic orientation: 
 Options:  <1> Genital candidiasis <2> Chancroid. <3> Secondary syphilis <4> Balanitis by Trichomonas. <5> Fungal infection by dermatophytes.
[A]: 1


[Q]: Question: Ferrous oxide, known as wustite (FeO) is non-stoichiometric because it contains: 
 Options:  <1> Excess iron <2> Oxygen excess <3> Iron defect. <4> Oxygen defect. <5> Defect of iron and oxygen.
[A]:
3