3138
A case of thoraco - abdominal rigidity leading to respiratory failure is described in the post - operative period in an elderly patient who received a moderate dose of fentanyl .
 Disease: rigidity; Disease: respiratory failure; Chemical: fentanyl
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:
 Disease: rigidity; Disease: respiratory failure; Chemical: fentanyl