16218
Inhibition of ghrelin O - acyltransferase attenuates food deprivation - induced increases in ingestive behavior .
 Chemical: O
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: O 
Answer:
 Chemical: O