25950
In 2008 , the US National Toxicology Program ' s Center for the Evaluation of Risks to Human Reproduction ( NTP - CERHR ) expressed concerns regarding BPA ' s potential health effects , and suggested improved study designs and methodologies that they believed would address those concerns .
 BPA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 BPA