19035
Silicon ( Si ) has been considered a very promising anode material for lithium ion batteries due to its high theoretical capacity .
 Chemical: Silicon; Chemical: Si; Chemical: lithium
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: Silicon, Si, lithium 
Answer:
 Chemical: Silicon; Chemical: Si; Chemical: lithium