I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Aside from the lignocellulose, wood consists of a variety of low molecular weight organic compounds, called extractives. The wood extractives are fatty acids, resin acids, waxes and terpenes. For example, rosin is exuded by conifers as protection from insects. The extraction of these organic materials from wood provides tall oil, turpentine, and rosin."?
A:
Which compounds was used by pine tree to be against insects?