5174
In contrast , shorthorn sculpin and black guillemot PCB exposures ( measured as sum of 55 congeners ) were elevated enough to pose risks to survival or reproduction .
 Chemical: PCB
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: PCB