Q: 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: Which of the following reactions of drug metabolism has an oxidation reaction as an intermediate step ?:
Options: <0> The transformation of a nitro group (for example, the one existing in nitrofurantoin) into amino. <1> The O-demethylation of an ether (for example, the transformation of codeine into morphine). <2> The breaking down of a diazo group to originate an amine (for example, the transformation of Prontosilrubrum into sulfanilamide. <3> The transformation of oxazepam in its glucuronide. <4> The transformation of acetylcholine into choline.
A:
pharmacology