15759
Hepatotumorigenicity of ethyl tertiary - butyl ether with 2 - year inhalation exposure in F344 rats .
 Chemical: ethyl tertiary - butyl ether
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ethyl tertiary - butyl ether 
Answer:
 Chemical: ethyl tertiary - butyl ether