2920
Both obstructive ( P less than 0 . 05 ) and central apnoea ( P less than 0 . 05 ) occurred more frequently in patients who had a morphine infusion .
 Disease: obstructive ( P less than 0 . 05 ) and central apnoea; Chemical: morphine
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: obstructive ( P less than 0 . 05 ) and central apnoea, morphine 
Answer:
 Disease: obstructive ( P less than 0 . 05 ) and central apnoea; Chemical: morphine