Detailed Instructions: 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: Which statement is true in relation to the Electron Repulsion Model of the Valencia layer applied to AB n molecules:
Options: <0> The AB2 molecules are always linear. <1> The AB6 molecules are always octahedral. <2> The AB3 molecules are always triangular. <3> The AB4 molecules are always tetrahedral. <4> The AB5 molecules are always trigonal bipyramidal.
A:
pharmacology