In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Q: Question: With respect to those known as solubility enhancers in biotechnological drugs we can say:
Options: <0> Which are not necessary given the good solubility of the active ingredients. <1> Which are necessary given the low solubility of the excipients. <2> They are not necessary in proteins, especially in non-glycosylated ones. <3> The use of lysine or arginine is often resorted to as exalting agents. <4> None of the above.
A:
pharmacology