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: If you want to study the efficacy and safety of a new cytostatic for a specific oncological process and, at the same time, contrast the efficacy that adds a new monoclonal antibody to this treatment, what would be the most appropriate study design?
Options: <1> Parallel test. <2> Cross test <3> Factorial test. <4> Sequential test. <5> Test of n = 1.
[EX A]: 3

[EX Q]: Question: In the oxaciclohexane-type conformer of sugar -D - (+) - glucopyranose:
Options: <1> One of the OH- groups is axial, but the remaining substituents are equatorial. <2> The CH2OH group is axial but the remaining groups are equatorial. <3> All groups are axial. <4> All groups are equatorial. <5> The CH2OH group is equatorial but the remaining groups are axial.
[EX A]: 4

[EX Q]: Question: A 20-year-old boy goes to the emergency room for fever of 39C, chills, papules and hemorrhagic pustules on the distal extensor surfaces of the extremities and arthritis of the knee. What is your diagnosis of initial suspicion?
Options: <1> Rheumatoid arthritis. <2> Reiter syndrome. <3> Urica Drop <4> Gonococcal arthritis. <5> Vasculitis of Cogan.
[EX A]:
4