7311
Cobalt whole blood concentrations in healthy adult male volunteers following two - weeks of ingesting a cobalt supplement .
 Chemical: Cobalt; Chemical: cobalt
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: Cobalt, cobalt 
Answer:
 Chemical: Cobalt; Chemical: cobalt