20420
METHODS : Male C57BL / 6J mice were pair - fed a modified Lieber - DeCarli diet composed of either moderate fat [ 30 % fat - derived calories ( MF ) ] or high fat [ 45 % fat - derived calories ( HF ) ] combined with increasing concentrations of ethanol ( 2 % - 6 % ) for 6 weeks .
 Chemical: ethanol
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: ethanol 
Answer:
 Chemical: ethanol