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: In relation to the bacterial growth in liquid medium not renewed, which of the following statements is correct? 
 Options:  <1> The generation time is a constant parameter. <2> The phase of exponential growth is perpetual. <3> There is a direct relationship between the specific growth rate and the generation time. <4> There is an inverse relationship between the specific growth rate and the generation time. <5> The generation time and the specific growth rate are not related.
[EX A]: 4

[EX Q]: Question: The lithium aluminum hydride is a nucleophile strong enough to be added to the carbonyl group of the carboxylate ions. This process allows obtaining: 
 Options:  <1> Primary alcohols. <2> Secondary alcohols <3> Tertiary alcohols. <4> Ketones <5> Ethers
[EX A]: 1

[EX Q]: Question: In the Th2-B cooperation process, what does the Th2 cell recognize on the surface of the B cell? 
 Options:  <1> The antigen bound to a surface immunoglobulin. <2> A fragment of antigen bound to the CD21 molecule. <3> Several cross-linked antigen fragments. <4> A fragment of antigen bound to a class II histocompatibility molecule. <5> A fragment of antigen bound to a class I histocompatibility molecule.
[EX A]:
4