Definition: 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'.
Input: 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.
