19653
Our aims were to assess exposure by the extent of ZnO - NP penetration into the viable epidermis and hazard by changes in the viable epidermal redox state for a number of topical products .
 Chemical: ZnO
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: ZnO 
Answer:
 Chemical: ZnO