7315
We assessed Co whole blood concentrations in four healthy adult male volunteers who ingested a commercially available Co supplement ( 0 . 4 mg Co / day ) for 15 or 16 days .
 Chemical: Co; Chemical: Co; 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, Co, Co 
Answer:
 Chemical: Co; Chemical: Co; Chemical: Co