Q:Extract the answer to the question from the following context. Question: Which conpounds is used by spruce tree to be against ants, fatty acids or rosin? Context: 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:
rosin