11798
Spontaneously hypertensive and Wistar Kyoto ( normotensive ) rats , implanted with radiotelemeters , were exposed once for 3h to 3 ppm acrolein gas or filtered air in whole - body plethysmograph chambers and challenged with a 10 % oxygen atmosphere ( 10min ) 24h later .
 Chemical: acrolein; Chemical: oxygen
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: acrolein; Chemical: oxygen