27499
Melatonin and ethanol intake exert opposite effects on circulating estradiol and progesterone and differentially regulate sex steroid receptors in the ovaries , oviducts , and uteri of adult rats .
 Chemical: Melatonin; Chemical: ethanol; Chemical: estradiol; Chemical: progesterone; Chemical: steroid
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: Melatonin, ethanol, estradiol, progesterone, steroid 
Answer:
 Chemical: Melatonin; Chemical: ethanol; Chemical: estradiol; Chemical: progesterone; Chemical: steroid