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In the present study , the authors determined if treatment with D - MED prevents the muscle rigidity caused by high - dose alfentanil anesthesia in the rat .
 Chemical: D - MED; Disease: muscle rigidity; Chemical: alfentanil
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: D - MED; Disease: muscle rigidity; Chemical: alfentanil