11942
Because resveratrol ( Res ) is attracting increased attention due to its antioxidative properties , we investigated the neuroprotective efficacy of Res in ethanol - treated embryonic dorsal root ganglion ( DRG ) neurons in vitro .
 Chemical: resveratrol; Chemical: Res; Chemical: Res; 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: resveratrol, Res, Res, ethanol 
Answer:
 Chemical: resveratrol; Chemical: Res; Chemical: Res; Chemical: ethanol