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'.

Question: Of the following reaction mechanisms, in which there is an inversion of the configuration from the reactant to the product of the reaction ?: 
 Options:  <1> Bimolecular nucleophilic substitution (SN2). <2> Unimolecular elimination (E1). <3> Unimolecular nucleophilic substitution (SN1). <4> Addition Markovnikov. <5> Addition anti-Markovnikov.
1

Question: The anterior pituitary gland: 
 Options:  <1> It is part of the hypothalamus. <2> It is regulated hormonally. <3> It communicates with the neurohypophysis. <4> It releases ADH and oxytocin. <5> It is formed by neurons.
2

Question: In relation to enzymatic inhibition: 
 Options:  <1> An irreversible inhibitor causes the denaturation of the enzyme. <2> The competing inhibitors bind to the substrate of the reaction. <3> A non-competitive inhibitor does not need to bind to the enzyme to exert its activity. <4> All inhibitors modify Vmax. <5> A competitive inhibitor increases the value of Km.

5