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We investigated the influence of TCDD on prostate cancer cells ( PC - 3 ) and non - tumor prostate cells ( PNT1A ) on 5 alpha - dihydrotestosterone - activated ARs containing CAG repeats within normal length range ( 16 , 22 , and 28 ) .
 Chemical: TCDD; Chemical: 5 alpha - dihydrotestosterone
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: TCDD; Chemical: 5 alpha - dihydrotestosterone