14325
Since the discovery that CO acts as a cytoprotective and homeostatic molecule , increasing research efforts have been devoted to the exploitation of its therapeutic effects .
 Chemical: CO
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: CO 
Answer:
 Chemical: CO