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The present study was designed to investigate whether nociceptin / orphanin FQ and nocistatin could modulate impairment of learning and memory induced by scopolamine , a muscarinic cholinergic receptor antagonist , using spontaneous alternation of Y - maze and step - down type passive avoidance tasks in mice .
 Chemical: nociceptin; Chemical: orphanin FQ; Chemical: nocistatin; Disease: impairment of learning and memory; Chemical: scopolamine
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: nociceptin; Chemical: orphanin FQ; Chemical: nocistatin; Disease: impairment of learning and memory; Chemical: scopolamine