8327
In the male brain , the medial preoptic nucleus ( POM ) is known to be a critical relay for the activation of sexual behaviour , with the aromatisation of testosterone into 17 beta - oestradiol ( E2 ) playing a key role .
 Chemical: testosterone; Chemical: 17 beta - oestradiol
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: testosterone; Chemical: 17 beta - oestradiol