771
The skin retention amount of QNT3 - 18 was 1 . 7 - fold higher than that of QNT3 - 20 .
 Chemical: QNT3 - 18; Chemical: QNT3 - 20
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: QNT3 - 18, QNT3 - 20 
Answer:
 Chemical: QNT3 - 18; Chemical: QNT3 - 20