14245
Protective effect of silymarin against ethanol - induced gastritis in rats : role of sulfhydryls , nitric oxide and gastric sensory afferents .
 silymarin, ethanol, sulfhydryls, nitric oxide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 silymarin, ethanol, sulfhydryls, nitric oxide