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The hippocampus - dependent version of the Y - maze task , which characterizes spatial recognition memory , capitalizes on the propensity of rats to gravitate toward novel spatial environments and is not contingent upon either appetite or the stress associated with water escape , two factors also affected by testosterone .
 Chemical: testosterone
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: testosterone