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: How many palindromic sequences exist on the human Y chromosome that allow Y-Y recombination ?: 
 Options:  <1> 8 <2> 6 <3> Four. <4> 10 <5> 12
[EX A]: 1

[EX Q]: Question: Regarding vaccination with rubella vaccine in pregnant women, point out the correct answer: 
 Options:  <1> It should be encouraged as it is very convenient for Public Health. <2> It is the procedure of choice for the control of congenital rubella syndrome. <3> It is no longer considered as an indication of abortion. <4> It is allowed in the case of vaccines of strain RA 27/3, but not in the case of vaccines of the strain Cendehill. <5> It must be administered in conjunction with specific immunoglobulin
[EX A]: 3

[EX Q]: Question: Acetylation of histones affects transcription: 
 Options:  <1> Blocking the incorporation of other components of the transcription machinery. <2> Preventing the remodeling of chromatin. <3> Facilitating the action of helicases. <4> Decreasing sensitivity to nuclear receptors. <5> Reducing the affinity of histones for DNA.
[EX A]:
5