27506
Conversely , ovarian PRA and PRB were positively regulated by ethanol and ethanol - melatonin combination , whereas PRA was down - regulated in the uterus and oviduct after ethanol consumption .
 Chemical: ethanol; Chemical: ethanol; Chemical: melatonin; 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, ethanol, melatonin, ethanol 
Answer:
 Chemical: ethanol; Chemical: ethanol; Chemical: melatonin; Chemical: ethanol