26852
Naturally occuring quercetin protects hepatocytes from ethanol - induced oxidative stress , and heme oxygenase - 1 ( HO - 1 ) induction and carbon monoxide ( CO ) metabolite may be implicated in the beneficial effect .
 Chemical: quercetin; Chemical: ethanol; Chemical: heme; Chemical: carbon monoxide; Chemical: CO
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: quercetin, ethanol, heme, carbon monoxide, CO 
Answer:
 Chemical: quercetin; Chemical: ethanol; Chemical: heme; Chemical: carbon monoxide; Chemical: CO