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: What is the biosynthetic route of terpenes in plants ?: 
 Options:  <0> They are synthesized by the mevalonic acid route or by the fatty acid route. <1> They are synthesized by the mevalonic acid route or by the deoxy-xylulose phosphate (DOXP) pathway also called GAP / Pyruvate. <2> They are synthesized by the mevalonic route and the sikimico route. <3> They are synthesized by the sikimic acid route or by the deoxy-xylulose phosphate (DOXP) pathway also called GAP / Pyruvate. <4> They are synthesized by the polyacetate route.
pharmacology