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Androgen receptor CAG repeat length modifies the effect of 2 , 3 , 7 , 8 - tetrachlorodibenzo - p - dioxin on receptor activity in human prostate cells .
 Chemical: Androgen; Chemical: 2 , 3 , 7 , 8 - tetrachlorodibenzo - p - dioxin
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: 2 , 3 , 7 , 8 - tetrachlorodibenzo - p - dioxin