25754
Upgraded Silicon Nanowires by Metal - Assisted Etching of Metallurgical Silicon : A New Route to Nanostructured Solar - Grade Silicon .
 Chemical: Silicon; Chemical: Silicon; Chemical: Silicon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Silicon; Chemical: Silicon; Chemical: Silicon