15334
Both gender - and strain - related differences in respiratory effects of BUP could be attributed to BUP itself rather than to its metabolite , NBUP .
 Chemical: BUP; Chemical: BUP; Chemical: NBUP
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: BUP, BUP, NBUP 
Answer:
 Chemical: BUP; Chemical: BUP; Chemical: NBUP