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.

Question: The septic shock that can occur in the course of systemic infections due to Gram-negative bacteria is due to:
Options: <0> Lipopolysaccharide. <1> Peptide-glucan. <2> Teicoic acids. <3> Flagellin <4> K. Antigen
pharmacology