Given the following 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.",  answer the following question. Note that the answer is present within the text.  Question: Which compounds was used by pine tree to be against insects?
A:
rosin