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: A tablet with gastrosoluble film cover is being designed. Which of the following excipients exerts the function of plasticizer in said cover ?: 
 Options:  <1> Hydroxypropylmethylcellulose. <2> Methylcellulose <3> Copolymer of methacrylic acid (Eudragit® E30D (A)) <4> Polyethylene glycol <5> Titanium oxide.
[EX A]: 4

[EX Q]: Question: Which amino acid serves as a starting point for the synthesis of porphyrins (heme group)? 
 Options:  <1> Valina <2> To the girl. <3> Asparagine <4> Lysine <5> Glycine
[EX A]: 5

[EX Q]: Question: If we value 25 mL of an H2A acid in concentration 0.1000M (pKa1 = 5, pKa2 = 9) with NaOH, the pH when we have evaluated 50% of the initial acid will be: 
 Options:  <1> one. <2> 3. <3> 5. <4> 7 <5> 9
[EX A]:
3