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: If the normal reduction potential of the pair Zn2 + / Zn is -0.76 V: 
 Options:  <1> Aqueous solutions of Zn2 + at pH = 0 release oxygen. <2> Putting metallic Zn in aqueous solution at pH = 0 releases oxygen. <3> Aqueous solutions of Zn2 + at pH = 0 give off hydrogen. <4> By putting metallic Zn in aqueous solution at pH = 0, hydrogen is evolved. <5> Zn2 + dismutates in aqueous solution at pH = 0.
[A]: 4


[Q]: Question: The reaction product of cyclohexanone with bromine catalyzed by a base is: 
 Options:  <1> 2-Bromocyclohexanone. <2> 2,2-Dibromocyclohexanone. <3> 2,2,6-Tribomociclohexanona. <4> 1,1-Dibromocyclohexane. <5> 2,2,6,6-Tetrabromocyclohexanone.
[A]: 5


[Q]: Question: The development of B cells in the bone marrow: 
 Options:  <1> It is dependent on the antigen. <2> It begins with gene rearrangements in the kappa light chain. <3> It is dependent on stromal cells. <4> It begins with gene rearrangements in the delta heavy chain. <5> It is dependent on T lymphocytes.
[A]:
3