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Sprague dawley male rats were divided into four different treatment groups viz : Control , aluminium treated , zinc treated and aluminium + zinc treated .
 Chemical: aluminium; Chemical: zinc; Chemical: aluminium; Chemical: zinc
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: aluminium; Chemical: zinc; Chemical: aluminium; Chemical: zinc