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The aim of the present study was to determine the sensitivity of the developing immune system to ethanol ( EtOH ) after exposure from postnatal day ( PND ) 10 onward .
 Chemical: ethanol; Chemical: EtOH
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, EtOH 
Answer:
 Chemical: ethanol; Chemical: EtOH