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The androgen receptor ( AR ) is a steroid hormone receptor that functions as a ligand - dependent transcriptional factor , which plays a key role in the development and progression of prostate cancer .
 Chemical: androgen; Chemical: steroid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: androgen; Chemical: steroid