3139
Hard - metals are made of tungsten carbide ( WC ) and metallic cobalt ( Co ) particles and are important industrial materials produced for their extreme hardness and high wear resistance properties .
 Chemical: tungsten carbide; Chemical: WC; Chemical: cobalt; 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: tungsten carbide, WC, cobalt, Co 
Answer:
 Chemical: tungsten carbide; Chemical: WC; Chemical: cobalt; Chemical: Co