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.
Q: Question: Becker muscular dystrophy is an alteration of:
Options: <0> The skeletal muscle. <1> The metabolism of lipids. <2> The bones. <3> Hepatic origin. <4> The bilirubin.
A:
pharmacology