28435
The combined use of ZnO , Mg , MgO , and silk provides routes to classes of thin - film transistors and mechanical energy harvesters that are soluble in water and biofluids .
 Chemical: ZnO; Chemical: Mg; Chemical: MgO
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: ZnO; Chemical: Mg; Chemical: MgO