10474
Sediments along the river Saale , one of the main tributaries of the river Elbe , were characterized with the yeast estrogen screen to elucidate possible sources of endocrine - disrupting compounds that might contribute to the downstream contamination of the river Elbe .
 Chemical: estrogen
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: estrogen