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The potential modifying effect of retinyl acetate ( RA ) on butylated hydroxyanisole ( BHA ) - induced rat forestomach tumorigenesis was examined .
 Chemical: retinyl acetate; Chemical: RA; Chemical: butylated hydroxyanisole; Chemical: BHA; Disease: forestomach tumorigenesis
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: retinyl acetate; Chemical: RA; Chemical: butylated hydroxyanisole; Chemical: BHA; Disease: forestomach tumorigenesis