55917
In 1997 , Scania introduced its 4-series range of buses , which utilised smaller and cleaner engines in order to comply with Euro2 emission limits .
 Scania, Euro2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Scania, Euro2