3400
Saline - pretreated controls given a test dose of morphine ( 20 mg / kg i . p . ) showed a pronounced rigidity recorded as tonic activity in the electromyogram .
 Chemical: morphine; Disease: rigidity
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: morphine, rigidity 
Answer:
 Chemical: morphine; Disease: rigidity