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Thus , to better characterize the dose range over which BPA alters sex specific neuroanatomy , we examined the impact of perinatal BPA exposure on two sexually dimorphic regions in the anterior hypothalamus , the sexually dimorphic nucleus of the preoptic area ( SDN - POA ) and the anterioventral periventricular ( AVPV ) nucleus .
 BPA, BPA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 BPA, BPA